03 Chevrolet/Cadillac/GMC Full Size Trucks and Utilities DTC B0951 After Headlamp Switch Replacement - kw DRL head lamp light inoperative

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

After replacing the headlamp switch on a 2003 Full Size Truck or Utility you may notice the following 2 changes.

1. The Green and Amber led indicators are missing from the face of the switch.
2. Trouble code B0951 will be set in the BCM after a replacement switch is installed.

Normal Condition - No repairs should be attempted.

A running change was implemented starting with the 2004 model year and the new replacement switch does not have the "auto" and "disable" LED indicators. The BCM will store a trouble code B0951 anytime a replacement switch is installed on a 2003 vehicle. This is due to the deletion of the Light Emitting Diodes (LEDs) and will not change the operation of the DRLs/headlamps.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

(2003 CadillacFull Size Trucks And Utilities) and (2003 Chevrolet Full Size Trucks And Utilities) and (2003 GMC Full Size Trucks And Utilities)

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