03-05 Cadillac/Chevrolet/GMC Full Size Trucks and Utilities DRLs Will Not Disable with Headlamp Switch - kw automatic head inoperative lamp light switch DRL

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

Some customer may state that the Daytime Running Lamps (DRLs) or the auto headlamps will not shut off when using the daytime running lamp disable switch (Which is part of the headlamp switch). Vehicles that were built in Canada and have RPO option (U19) were built with different software that does not allow the DRLs or Auto headlamp to be shut off. Canada law prohibits disabling daytime running lamps or auto headlamps.

This is a normal operation of the vehicle and no repairs should be attempted.

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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.

(2003-2005 Full Size Trucks and Utilities)

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