2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1254

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1254

resistance. If the circuits test normal, replace the drive motor generator battery assembly.

7. Ignition OFF, disconnect the X2 and X3 drive motor generator power inverter module cables.

8. Test for infinite resistance between the terminals listed below and ground;

* B+ (300 V) X2

* Ground (300 V) X3

瀚慖f less than the specified value replace the high voltage cables.

9. Test for infinite resistance between the B+ (300 V) terminal X1 and the ground (300 V) terminal X2 cables.

瀚慖f less than the specified range replace the high voltage cables.

10. Disconnect the air conditioning control module terminal B+ (300 V) X4 and the ground (300 V) terminal X5.

11. Test for infinite resistance between the terminals listed below and ground:

* B+ (300 V) X4

* Ground (300 V) X5

瀚慖f less than the specified range, replace the air conditioning control module.

12. Test for greater than 50k ohm between the B+ (300 V) terminal X4 and the ground (300 V) terminal X5.

瀚慖f less than the specified range, test the circuits for a short between them. If the circuits test normal, replace the air conditioning control

module assembly.

13. If all circuits test normal, replace the drive motor generator power inverter module.

Repair Instructions

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

* Drive Motor Battery Negative Relay Cable Replacement ()

* Drive Motor Battery Positive Relay Cable Replacement ()

* Drive Motor Battery 300-Volt Positive and Negative Cable Replacement ()

* Drive Motor Generator Battery Replacement and Shipping Preparation ()

* Air Conditioning Compressor Replacement (HP2) (See: Heating and Air Conditioning/Compressor HVAC/Service and Repair/Removal and

Replacement)Air Conditioning Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) (See: Heating and Air

Conditioning/Compressor HVAC/Service and Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module,

drive motor generator power inverter module, or air conditioning control module replacement, setup, and programming

P0BBD

DTC P0BBD

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 P0BBD

- Hybrid Battery Pack Voltage Variation High

Circuit/System Description

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery

module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred

to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The

drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery

control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactor.

The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and