2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 662

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 662

Repair Instructions

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

* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and

Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM, inside rearview mirror, and rearview

camera module replacement, setup, and programming

B2555

DTC B2555

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 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.