2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 625
Circuit/System Description
When the body control module (BCM) signals for courtesy lamp operation, a message is sent over the serial data circuit to the driver door and
passenger door switches. The driver door switch and passenger door switch the applies battery voltage to the left and right courtesy lamp control
circuits illuminating the door courtesy lamps. The driver door and passenger door switches also provide ground to the lamps.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* A message is sent from the BCM over the serial data circuit to the driver door and passenger door switches to active the door courtesy lamps.
Conditions for Setting the DTC
B2555 01
The driver or passenger door switch detects a short to voltage in the courtesy lamp control circuit.
B2555 02
The driver or passenger door switch detects a short to ground in the courtesy lamp control circuit.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A scan tool CLEAR DTCs command is issued for that switch module.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Interior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems 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 Testing
Note: Each courtesy lighting component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify
the following:
* Courtesy lighting components the vehicle is equipped with.
* Component locations on the courtesy lighting control circuit
* Each component's control and ground circuit terminals
