2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 474

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 474

should be current.

* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters

listed in Circuit/System Verification will determine if there is a power mode fault.

Reference Information

Schematic Reference

* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)

* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Power Distribution Schematics)

Connector End View Reference

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

Description and Operation

Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)

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)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Verify that the following DTCs are not set: U1814, B1428.

瀚慖f either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding

ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in

correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.

Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Inspect for an open Ign Switch fuse. The fuse should be OK.

瀚慖f the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.

* Battery positive voltage of the ignition switch

* Accessory voltage

* Off/Run/Crank voltage

* Ignition 1 voltage

* Accessory wakeup serial data (BCM output)

* Run/crank ignition 1 voltage (BCM output)