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Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step test determines if the problem exists in the wiring or the BCM.
  2. 3:  After replacement of the BCM you must calibrate the new module for proper operation.
DTC B2550

Step Action Yes No
Schematic Reference:  Exterior Lights Schematics  
1 Did you perform the Lighting System Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Lighting Systems 
2  Test the following circuits as indicated. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
  1. The backup lamp voltage supply circuit for an open, high resistance, short to voltage or short to ground.
  2. The backup lamp ground circuit for an open or high resistance.

Did you find and correct the condition?		 Go to Step 4  Go to Step 3 
3 
IMPORTANT: Perform the setup procedure for the BCM.
Replace the body control module (BCM). Refer to BODY CONTROL MODULE REPLACEMENT in Body Control System.Did you complete the replacement?		 Go to Step 4  -
4
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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