2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1147

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1147

Repair Instructions

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

* Drive Motor Battery Sensor Module Wiring Harness Replacement ()

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

replacement, setup and programming

P0ADB

DTC P0ADB or P0ADC

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 P0ADB

- Hybrid Battery Positive Contactor Control Circuit Low Voltage

DTC P0ADC

- Hybrid Battery Positive Contactor Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

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 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. The

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

The hybrid drive motor generator battery contains 3 high voltage contactors. The contactors allow the high voltage DC batteries to be connected to

the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The 3 contactors are a positive high voltage

contactor, negative high voltage contactor, and current limit relay. These contactor/relays close and open in sequence and are controlled by the

drive motor generator battery control module. The drive motor generator battery control module monitors the control circuit voltage and 12 V

reference circuit internal to the control module to determine if the circuit is operating.

Conditions for Running the DTC

P0ADB

* The ignition is ON.

* The jump assist function is not active.

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

* High voltage contactors are commanded closed.

P0ADC

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

* High voltage contactors are commanded open.

Conditions for Setting the DTC

P0ADB

The drive motor generator battery control module compares the contactor control circuit to the drive motor generator battery control modules

internal 12 V measurement reference circuit. This DTC sets when the contactor control circuit voltage is 2 V less than the drive motor generator

battery control module internal voltage reference when the high voltage positive contactor is commanded closed.