2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 572
requesting the BCM to remove battery voltage from the backup lamp signal circuit. The BCM will not apply battery voltage to the backup lamps if
the engine is not running.
Conditions for Running the DTC
Reverse Gear engaged.
Conditions for Setting the DTC
B2545 01
The BCM detects a short to voltage on the backup lamps control circuit.
B2545 02
The BCM detects a short to ground on the backup lamps control circuit.
B2545 04
The BCM detects an open/high resistance both backup lamps control circuits.
Action Taken When the DTC Sets
For B2545 01, both backup lamps will be continuously illuminated.
For B2545 02 and B2545 04, both backup lamps will be inoperative.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Reference Information
Schematic Reference
Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)
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
Engine running, command the Backup Lamps ON and OFF with a scan tool. The E5A backup lamp-left and the E5B backup lamp-right should turn
ON and OFF when changing between the commanded states.
If the E5A backup lamp-left or the E5B backup lamp-right is always OFF, inspect for a burned out bulb or corrosion of the bulb sockets.
If the E5A backup lamp-left and the E5B backup lamp-right are always OFF or always ON, perform the Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector K9 BCM.
