Friday, July 19, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 579


DTC Descriptors



DTC B2555 01



- Passenger Compartment Lamp Control Circuit Short to Battery



DTC B2555 02



- Passenger Compartment Lamp Control Circuit Short to Ground



Diagnostic Fault Information



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

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