| Subject: | Headlights Do Not Turn On Until The Shifter Is Placed Into Gear |
| Models: | 2007 Buick Rainier |
| 2007 Chevrolet Trailblazer and Trailblazer SS |
| 2007 GMC Envoy and Envoy Denali |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment that when starting the vehicle, their headlights do not come on until the vehicle is placed into gear. This could apply to Daytime Running Lights and/or Automatic Headlamp operation when it is dark out. This was due to a software
change in the Body Control Module for all 2007 Mid-Sized Utilities.
Recommendation/Instructions:
This is normal operation. No repairs are recommended. The Daytime Running Lights and the Automatic Headlamps will not come on until the shifter is taken out of the Park position. This information can be referenced in the section 3 of the customers owners
manual under Automatic Headlamp System.
Please follow this diagnostic or repair 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.
