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Pontiac Repair/2007 pontiac grand prix low beams will not turn off


I have a 2007 Pontiac grand prix. My low beams come on automatically when it gets dark. They will not turn off now. We have replaced the multifunction switch and still not working. We pulled the hdm module and they went off, put it back in and they work. We have recently installed an aftermarket cd player, I do not know if that has anything to do with it, but also my door locks do not lock when u put the car in drive, and I do not think that they lock at all, because I locked my car the other night and the next morning it was unlocked. Also my trunk button on the driver door does not work. Can hear a clicking under the steering column when u press it. Not sure if any of this ties together but it all started after we installed the radio. Please help!!!

Hi gina:

as for the head lamps that headlamp control relay/module is why the light would not turn off it stuck on and it will happen again. usually it's the other way around that the lamps will not turn on.  as for the door locks if they work with the switches and the key fob the options in the BCM for some reason are not working look in the owners manual for customization for door locks and change the mode. for the trunk lock if you hear the clicking but it will not pop the trunk it could just be a relase actuator in the trunk it's self. with anoy of these issues it's just a guess with out seeing it. good luck :-)  

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Todd Puccio


General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.


Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician


Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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