2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 745
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Inspect the trailer rear fog lamp bulb for an open or shorted filament.
瀚慖f the bulb is inoperable, replace the bulb.
2. Park lamp switch OFF, clear the DTC, test the trailer rear fog lamp circuit for a short to voltage, short to ground, an open, or high resistance.
瀚慖f all circuits/connections test normal, replace the XBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for XBCM replacement, setup, and programming
Gasoline With LY6, or Diesel
DTC B3894 (Gasoline With LY6, or Diesel)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provide an overview of each diagnostic category.
DTC Descriptor
DTC B3894 5A
- Stop Lamp Switch Circuit Plausibility Failure
Circuit/System Description
The brake switch is hard wired to the trailer brake control module (TBCM). The body control module (BCM) sends a brake switch status serial data
message to the trailer brake control module. The trailer brake control module compares the states of the brake switch signal to the serial data
message after a master cylinder brake pressure sensor threshold is exceeded. If the brake switch signal and the serial data message are not in
agreement or if the serial data message is not valid, a DTC will set and the trailer brake control system will be disabled.
Conditions for Running the DTC
* Battery voltage is 9.5-17 V.
* The module initialization has taken place.
* The master cylinder brake pressure exceeds threshold
Conditions for Setting the DTC
* The brake switch serial data message is not valid.
* The actual brake switch input to the trailer brake control module, and the serial data information for the brake switch do not match.
Action Taken When the DTC Sets
* The trailer brake control will be disabled for the remainder of the ignition cycle.
* The driver information center will display Service Trailer Brake System.
Showing posts with label Testing/Circuit Testing). Show all posts
Showing posts with label Testing/Circuit Testing). Show all posts
Sunday, December 8, 2019
Saturday, December 7, 2019
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 720
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 720
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be
between 3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is greater than 250 counts.
瀚慖f greater than the specified range, test the signal circuit terminal 9 for a short to ground.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan
tool parameter is less than 4 counts.
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
瀚慖f the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Air Inlet Valve Actuator Replacement)
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator /
Motor/Service and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve
Actuator Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (
See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be
between 3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is greater than 250 counts.
瀚慖f greater than the specified range, test the signal circuit terminal 9 for a short to ground.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan
tool parameter is less than 4 counts.
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
瀚慖f the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Air Inlet Valve Actuator Replacement)
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator /
Motor/Service and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve
Actuator Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (
See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve
Wednesday, December 4, 2019
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 669
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 669
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not
available at the time of service, contact the customer and ask if any other keys can be provided for service. If unavailable, a new second
key can be created.
1. Inspect all available vehicle keys that they are correct vehicle keys.
瀚慖f not a correct vehicle key, replace the key.
2. While viewing the scan tool TDM Transponder Key parameter, turn ON the ignition with each of the available vehicle keys. The parameter
should read Present with all available keys.
瀚慖f only one key results in the parameter reading Not Present, replace the appropriate key.
瀚慖f all available keys result in the parameter reading Not Present, replace the TDM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Replacing Keys (North America except Canada) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Service and
Repair/Replacing Keys (North America Except Canada))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for TDM replacement, setup, and programming
B3060
DTC B3060
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B3060 00
- Unprogrammed Transponder Identification Code Received
Circuit/System Description
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is
energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value,
which is received by the theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the
learned key code. If the value is correct, the TDM will send the prerelease password via the serial data circuit to the engine control module (ECM).
If the transponder value does not match the learned key code or a transponder value is not received, the TDM will send the start disable password to
the ECM.
Conditions for Running the DTC
Ignition is in the Accessory or Run position.
Conditions for Setting the DTC
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not
available at the time of service, contact the customer and ask if any other keys can be provided for service. If unavailable, a new second
key can be created.
1. Inspect all available vehicle keys that they are correct vehicle keys.
瀚慖f not a correct vehicle key, replace the key.
2. While viewing the scan tool TDM Transponder Key parameter, turn ON the ignition with each of the available vehicle keys. The parameter
should read Present with all available keys.
瀚慖f only one key results in the parameter reading Not Present, replace the appropriate key.
瀚慖f all available keys result in the parameter reading Not Present, replace the TDM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Replacing Keys (North America except Canada) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Service and
Repair/Replacing Keys (North America Except Canada))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for TDM replacement, setup, and programming
B3060
DTC B3060
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B3060 00
- Unprogrammed Transponder Identification Code Received
Circuit/System Description
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is
energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value,
which is received by the theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the
learned key code. If the value is correct, the TDM will send the prerelease password via the serial data circuit to the engine control module (ECM).
If the transponder value does not match the learned key code or a transponder value is not received, the TDM will send the start disable password to
the ECM.
Conditions for Running the DTC
Ignition is in the Accessory or Run position.
Conditions for Setting the DTC
Monday, December 2, 2019
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 624
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 624
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Connect a test lamp between the control circuit terminal 9 and ground.
3. Ignition ON, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the
commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
4. Ignition OFF, connect the harness connector at the inside rearview mirror. Disconnect the X5 harness connector at the underhood fuse block.
5. Connect a test lamp between the control circuit terminal H8 and ground.
6. Ignition ON, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the
commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
7. If all circuits test normal, replace the underhood fuse block.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and
Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM, inside rearview mirror, and rearview
camera module replacement, setup, and programming
B2555
DTC B2555
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2555 01
- Passenger Compartment Lamp Control Circuit Short to Battery
DTC B2555 02
- Passenger Compartment Lamp Control Circuit Short to Ground
Diagnostic Fault Information
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Connect a test lamp between the control circuit terminal 9 and ground.
3. Ignition ON, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the
commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
4. Ignition OFF, connect the harness connector at the inside rearview mirror. Disconnect the X5 harness connector at the underhood fuse block.
5. Connect a test lamp between the control circuit terminal H8 and ground.
6. Ignition ON, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the
commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
7. If all circuits test normal, replace the underhood fuse block.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and
Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM, inside rearview mirror, and rearview
camera module replacement, setup, and programming
B2555
DTC B2555
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2555 01
- Passenger Compartment Lamp Control Circuit Short to Battery
DTC B2555 02
- Passenger Compartment Lamp Control Circuit Short to Ground
Diagnostic Fault Information
Wednesday, November 20, 2019
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 355
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 355
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Clear all DTCs and operate the integrated switches at each door control module within the Conditions for Running the DTC. The DTC should not
set.
If the DTC sets, replace the appropriate door switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for DDS and PDS replacement, setup, and programming
HVAC - Automatic
DTC B1023
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1023 05
- Integral Switch Performance Short to Ground
DTC B1023 06
- Integral Switch Performance Short to Battery or Open
DTC B1023 61
- Integral Switch Performance Signal Invalid
Circuit/System Description
This DTC is not associated with any wiring. It is an internal fault inside the HVAC control module for a stuck or shorted control button.
Conditions for Running the DTC
Battery voltage is between 9-16 volts and data link communications operate normally.
Conditions for Setting the DTC
The HVAC control module has internal fault inside the HVAC control module for a stuck or shorted control button.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Circuit/System Verification
1. Reprogram the HVAC control module that set DTC B1023. The module should successfully reprogram.
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Clear all DTCs and operate the integrated switches at each door control module within the Conditions for Running the DTC. The DTC should not
set.
If the DTC sets, replace the appropriate door switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for DDS and PDS replacement, setup, and programming
HVAC - Automatic
DTC B1023
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1023 05
- Integral Switch Performance Short to Ground
DTC B1023 06
- Integral Switch Performance Short to Battery or Open
DTC B1023 61
- Integral Switch Performance Signal Invalid
Circuit/System Description
This DTC is not associated with any wiring. It is an internal fault inside the HVAC control module for a stuck or shorted control button.
Conditions for Running the DTC
Battery voltage is between 9-16 volts and data link communications operate normally.
Conditions for Setting the DTC
The HVAC control module has internal fault inside the HVAC control module for a stuck or shorted control button.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Circuit/System Verification
1. Reprogram the HVAC control module that set DTC B1023. The module should successfully reprogram.
Monday, November 18, 2019
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 308
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 308
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be
between 3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is greater than 250 counts.
瀚慖f greater than the specified range, test the signal circuit terminal 9 for a short to ground.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan
tool parameter is less than 4 counts.
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
瀚慖f the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Air Inlet Valve Actuator Replacement)
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator /
Motor/Service and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve
Actuator Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (
See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be
between 3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is greater than 250 counts.
瀚慖f greater than the specified range, test the signal circuit terminal 9 for a short to ground.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan
tool parameter is less than 4 counts.
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
瀚慖f the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Air Inlet Valve Actuator Replacement)
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator /
Motor/Service and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve
Actuator Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (
See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve
Sunday, November 17, 2019
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 286
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 286
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be
between 3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is greater than 250 counts.
瀚慖f greater than the specified range, test the signal circuit terminal 9 for a short to ground.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan
tool parameter is less than 4 counts.
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
瀚慖f the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Air Inlet Valve Actuator Replacement)
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator /
Motor/Service and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve
Actuator Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (
See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be
between 3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is greater than 250 counts.
瀚慖f greater than the specified range, test the signal circuit terminal 9 for a short to ground.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan
tool parameter is less than 4 counts.
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
瀚慖f the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Air Inlet Valve Actuator Replacement)
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator /
Motor/Service and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve
Actuator Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (
See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve
Thursday, October 31, 2019
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 3120
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 3120
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the yaw rate sensor.
2. Ignition ON, verify that a test lamp illuminates between the module voltage circuit and ground.
瀚慖f the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
EBCM.
3. Ignition OFF, test for less than 5 ohms between the module ground circuits and ground.
瀚慖f greater than the specified value, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
4. If all circuits test normal, replace the yaw rate sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Wiring Repairs/GMLAN Wiring Repairs)
* ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and
Operation/ABS Description and Operation) for the ABS - Hybrid
* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Yaw Rate Sensor/Service and Repair/Less than 3900 kg (8600 lb) GVW) for the ABS - Non-Hybrid Less than 3900 kg
(8600 lb) GVW
* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Yaw Rate Sensor/Service and Repair/Less than 3900 kg (8600 lb) GVW) for the ABS - Non-Hybrid Greater than/Equal to
3900 kg (8600 lb) GVW
* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
U2163
DTC U2105-U2199
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC U2142 00
- Lost Communication With Yaw Rate Sensor (YRS)
Circuit/System Description
Modules connected to the CAN bus serial data circuits monitor for serial data communications during normal vehicle operation. Operating
information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be
exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an
availability indication of the transmitter module. Each message contains the identification number of the transmitter module.
The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the
ignition key is in ACC, ON or START. The EBCM, Yaw Rate and Lateral Acceleration Sensor are the only modules connected to the CAN bus
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the yaw rate sensor.
2. Ignition ON, verify that a test lamp illuminates between the module voltage circuit and ground.
瀚慖f the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
EBCM.
3. Ignition OFF, test for less than 5 ohms between the module ground circuits and ground.
瀚慖f greater than the specified value, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
4. If all circuits test normal, replace the yaw rate sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Wiring Repairs/GMLAN Wiring Repairs)
* ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and
Operation/ABS Description and Operation) for the ABS - Hybrid
* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Yaw Rate Sensor/Service and Repair/Less than 3900 kg (8600 lb) GVW) for the ABS - Non-Hybrid Less than 3900 kg
(8600 lb) GVW
* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Yaw Rate Sensor/Service and Repair/Less than 3900 kg (8600 lb) GVW) for the ABS - Non-Hybrid Greater than/Equal to
3900 kg (8600 lb) GVW
* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
U2163
DTC U2105-U2199
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC U2142 00
- Lost Communication With Yaw Rate Sensor (YRS)
Circuit/System Description
Modules connected to the CAN bus serial data circuits monitor for serial data communications during normal vehicle operation. Operating
information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be
exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an
availability indication of the transmitter module. Each message contains the identification number of the transmitter module.
The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the
ignition key is in ACC, ON or START. The EBCM, Yaw Rate and Lateral Acceleration Sensor are the only modules connected to the CAN bus
Subscribe to:
Posts (Atom)