What may be causing issue with headlights turning on by themselves even when car is off?

Asked by Apr 16, 2014 at 01:54 PM about the 2007 Pontiac Grand Prix

Question type: Maintenance & Repair

My wife drives a 2007 Grand Prix - Last week when I came home I noticed that even
though the car was off her headlights (and only her headlights were on. By the time I
got into the house and asked her about it she noticed her lights were on from the
window and by the time we got back outside they were off again. Then comes last
night we get home from working out lights turn off as we turn off the car we get in the
house about five minutes or so later look outside and once again the headlights were
on, this time we could not get them to turn back off unless we turned the car on and
back off but again within about 5 minutes of turning the engine off and locking the car
the lights were back on.

1 Answer

4,445

This can be caused by a faulty Body Control Module or faulty snesor. The headlights are controlled from the dash but also from the security system (unlock=on, lock=delay off). Stray voltage or a worn sensor can cause the BCD to randomly power and unpower the headlights while the car is off or locked. You'll need to have the BCM scanned for trouble codes to see what's going on.

11 out of 11 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Headlights coming back on once car is parked and off. 7 answers

    My 2007 Pontiac Grand Prix headlights turn back on after parking the car. They will be off as normal, then sometimes (Minutes or even hours later) when I look outside the lights are on. This car h...

    2007 Pontiac Grand Prix

    -

    Maintenance & Repair

  • Is there something wrong with my headlight switch 7 answers

    Why is there an off position on the headlight switch if the headlights turn on when the ignition is turned on? I can't take the car to the drive in because the headlights stay on no matter what positi...

    2003 Pontiac Grand Prix SE

    -

    Maintenance & Repair

  • Car turns off randomly.. 24 answers

    I have a 2002 pontiac grand prix and it has been acting crazy. First, the RPM gauge will jump erratically, my car revving and slowing down with it. Then, it sputters, then I lose my accelerator all ...

    2002 Pontiac Grand Prix

    -

    Maintenance & Repair

  • Front headlights won't work 19 answers

    We have a 2007 Pontiac Grand Prix. We have replaced the bulbs and checked the fuse which was okay but the front headlights still will not come on. The bright head lights and running lights still wor...

    2007 Pontiac Grand Prix Base

    -

    Maintenance & Repair

  • Headlight doors open and closes sometimes when the drivers door is shut 44 answers

    2000 Firebird Trans Am, occasionally when the drivers door is shut the headlights will open and close with a grinding noise. The alarm is not set when the car is home and it has done it here so it doe...

    2000 Pontiac Firebird

    -

    Maintenance & Repair

Search Pontiac Grand Prix Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,890
#2 Tom Demyan
Tom Demyan
Reputation 2,580
#3 munron
munron
Reputation 2,060
View All

Related Models For Sale

Used Chevrolet Impala
901 Great Deals out of 35,272 listings starting at $1,700
Used Dodge Charger
468 Great Deals out of 30,105 listings starting at $2,275
Used Pontiac G8
17 Great Deals out of 456 listings starting at $5,800
Used Pontiac G6
76 Great Deals out of 5,050 listings starting at $1,295
Used Chevrolet Monte Carlo
18 Great Deals out of 1,692 listings starting at $2,491
Used Pontiac Grand Am
1,661 listings starting at $1,298
Used Chevrolet Malibu
1,130 Great Deals out of 82,882 listings starting at $2,328
Used Ford Mustang
534 Great Deals out of 42,737 listings starting at $1,699
Used Pontiac GTO
5 Great Deals out of 471 listings starting at $5,500
Used Nissan Maxima
381 Great Deals out of 24,382 listings starting at $999
Used Jeep Grand Cherokee
904 Great Deals out of 66,337 listings starting at $1,500
Used Nissan Altima
1,074 Great Deals out of 82,588 listings starting at $1,988

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
13 Great Deals out of 473 listings starting at $900
2007 Pontiac Grand Prix For Sale
518 listings starting at $2,995
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 630 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
439 listings starting at $5,900