2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1356

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1356

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 contactors.

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

system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through

serial data. They hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

Conditions for Running the DTC

* The ignition is ON.

* The 12 V battery voltage is 9-18 V.

* High voltage contactors are closed.

Conditions for Setting the DTC

DTCs P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87,

P0B8C, P0B91, P0B96

The voltage of any two consecutive batteries multiplied by 20 is 70 V greater than or less than the total pack voltage for 16 seconds.

DTC P0B9B

The voltage of battery 20 multiplied by 20 is 70 V greater than or less than the total pack voltage for 16 seconds. DTC P0B9B only requires one

voltage failure because battery 20 is the last battery.

Action Taken When the DTC Sets

* DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88,

P0B8D, P0B92, P0B97, and P0B9C are type B DTCs.

* The drive motor generator battery control module commands the battery vent fan to high speed.

* If more than 4 of these DTCs are set, the drive motor generator battery sends a message to the hybrid powertrain control module to reduce the

power use limit to 50 percent.

Conditions for Clearing the DTC

DTCs P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,

P0B91, P0B96, and P0B9B are type B DTCs.

Reference Information

Schematic Reference

Hybrid Energy Storage Schematics ()

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Drive Motor Battery System Description ()

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)