How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dan Your Own Question
Dan
Dan, Technician
Category: Pontiac
Satisfied Customers: 23591
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
17871496
Type Your Pontiac Question Here...
Dan is online now
A new question is answered every 9 seconds

Headlights randomly come on with car turned off keys in

Customer Question

Headlights randomly come on with car turned off keys in hand. 2007 Pontiac gran prix
Submitted: 10 months ago.
Category: Pontiac
Customer: replied 10 months ago.
I have replaced the combo switch and the body control module using gmparts. Only way to get the lights to turn off is to pull the module/relay.
Expert:  Dan replied 10 months ago.

Hello, my name is***** it the hi beams or low beams that come on?

Customer: replied 10 months ago.
Low beams and quite possibly daytime running light mode.
Expert:  Dan replied 10 months ago.

I'm assuming you tried to replace relay? Thanks.

Customer: replied 10 months ago.
I have tried more than one
Expert:  Dan replied 10 months ago.

Does unplugging the BCM shut off the lights?

Customer: replied 10 months ago.
Don't know buried in dash. Had gm tech replace with new and reprogram. Found no issues. Problem resufaced almost immediately.
Expert:  Dan replied 10 months ago.

The body control module activates the relay and relay sends power to the lights. Since removing relay shuts off lights that would mean possible problems are relay, wiring, or BCM. Since BCM and relay have been replaced that would leave problem as wiring. There is a pink/white wire that goes from fuse box to body control module, if this wire is grounding out it will activate the relay. I'd probably run a new wire at this point since everything else has been done. Here is a wiring diagram so you can see how system works. Let me know how it goes or if you have more questions. Thanks.

-

https://www.dropbox.com/s/q6vgsnrva83ufbf/hldwd.pdf?dl=0

-

Customer: replied 10 months ago.
Thank you I will give it a try.
Expert:  Dan replied 10 months ago.

No problem, let me know how it turns out or if you run into questions. You can reply to this answer at any time without additional fees. Thanks again and have a good night.

Related Pontiac Questions