2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 584

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 584

6. If all circuits test normal, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater

Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming

B2455

DTC B2455

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 B2455 04

- Cellular Phone Microphone Circuit Malfunction Open Circuit

Diagnostic Fault Information

Circuit/System Description

The communication interface module (CIM) provides the cellular phone microphone with a supplied voltage on the cellular phone microphone

signal circuit. When the microphone is in use, voice data from the user is sent back to the CIM on the signal circuit. The CIM provides a ground for

the microphone via the low reference circuit.

Conditions for Running the DTC

* The ignition must be in the RUN or ACC position.

* The system voltage is at least 9.5 V and no more than 15.5 V.

Conditions for Setting the DTC

* The CIM detects an open, short to ground or short to voltage in the cellular phone microphone signal circuit for 10 seconds or greater.

* The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater.

Actions Taken When the DTC Sets

* The OnStar(R) status LED turns red.

* The CIM will not receive a signal from the microphone.

* Calls can be placed but the caller cannot be heard.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

OnStar Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/OnStar Schematics)

Connector End View Reference

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 542

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 542

6. If all circuits test normal, replace the HSM.

B2345 13

1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.

2. Test for greater than 850 Ohms between the signal and the low reference circuits listed below:

* Driver seat cushion terminal 9 X4 and terminal 6 X2

* Passenger seat cushion terminal 20 X4 and terminal 8 X2

瀚慖f less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the

appropriate seat cushion heater element/temperature sensor.

3. Test for greater than 850 Ohms between the signal and the low reference circuits listed below:

* Driver seat back terminal 19 X4 and terminal 5 X2

* Passenger seat back terminal 10 X4 and terminal 7 X2

瀚慖f less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the

appropriate seat back heater element/temperature sensor.

4. If all circuits test normal, replace the HSM.

B2345 42 or B2345 4B

If either DTC is set, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater

Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming

Rear Seat

DTC B2345 (Rear Seat)

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 B2345 00

- Seat Heater Disable Circuit

DTC B2345 13

- Seat Heater Disable Circuit Voltage Low / High Temperature

DTC B2345 42

- Seat Heater Disable Circuit Calibration Data Set Not Programmed

DTC B2345 4B

- Seat Heater Disable Circuit Calibration Not Learned

Diagnostic Fault Information

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 533

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 533

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

6. If all circuits test normal, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming

B2180

DTC B1935 or B2180 (Dealer Installed)

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 B1935 04

- Left Seat Back Heater Circuit Open

DTC B1935 0A

- Left Seat Back Heater Circuit Rate of Change Below Threshold

DTC B1935 0B

- Left Seat Back Heater Circuit Current Above Threshold

DTC B1935 0C

- Left Seat Back Heater Circuit Current Below Threshold

DTC B1935 0D

- Left Seat Back Heater Circuit Resistance Above Threshold

DTC B1935 0E

- Left Seat Back Heater Circuit Resistance Below Threshold

DTC B1935 1F

- Left Seat Back Heater Circuit Intermittent

DTC B2180 04

- Right Seat Back Heater Circuit Open

DTC B2180 0A

- Right Seat Back Heater Circuit Rate of Change Below Threshold

DTC B2180 0B

- Right Seat Back Heater Circuit Current Above Threshold

DTC B2180 0C

- Right Seat Back Heater Circuit Current Below Threshold

DTC B2180 0D

- Right Seat Back Heater Circuit Resistance Above Threshold

DTC B2180 0E

- Right Seat Back Heater Circuit Resistance Below Threshold

DTC B2180 1F

- Right Seat Back Heater Circuit Intermittent

Diagnostic Fault Information

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 523

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 523

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

6. If all circuits test normal, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming

HP2 W/O Memory

DTC B1935 or B2180 (HP2 w/o Memory)

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 B1935 04

- Left Seat Back Heater Circuit Open

DTC B1935 0A

- Left Seat Back Heater Circuit Rate of Change Below Threshold

DTC B1935 0B

- Left Seat Back Heater Circuit Current Above Threshold

DTC B1935 0C

- Left Seat Back Heater Circuit Current Below Threshold

DTC B1935 0D

- Left Seat Back Heater Circuit Resistance Above Threshold

DTC B1935 0E

- Left Seat Back Heater Circuit Resistance Below Threshold

DTC B1935 1F

- Left Seat Back Heater Circuit Intermittent

DTC B2180 04

- Right Seat Back Heater Circuit Open

DTC B2180 0A

- Right Seat Back Heater Circuit Rate of Change Below Threshold

DTC B2180 0B

- Right Seat Back Heater Circuit Current Above Threshold

DTC B2180 0C

- Right Seat Back Heater Circuit Current Below Threshold

DTC B2180 0D

- Right Seat Back Heater Circuit Resistance Above Threshold

DTC B2180 0E

- Right Seat Back Heater Circuit Resistance Below Threshold

DTC B2180 1F

- Right Seat Back Heater Circuit Intermittent

Diagnostic Fault Information