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  1. #1
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    Default Another low beam headlight issue. Please help.

    So I just bought a 2007 grand prix gt about a month ago. So last week the low beams just quit working. I've replaced the relay,bulbs,and headlight switch. As far as I can tell I'm not getting power to the relay box. High beams work, all blinkers work. DRLs work. Fog lights even work. Checked all fuses and were good. Replaced all headlight fuses anyways. I'm stumped. Any suggestions on what to look for or where would be greatly appreciated.
    Last edited by Nicksmith5553; 12-19-2016 at 01:02 PM. Reason: Spelling errors

  2. #2
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: Another low beam headlight issue. Please help.

    Did you replace the HDM module/relay?

    That's a pretty common failure on the 04+ cars.

    SMGPFC Member #1

  3. #3
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    Default Re: Another low beam headlight issue. Please help.

    Yep, first thing I did. Forgot to mention this. I pulled the headlights and found the brights to be spliced into the low beams so that they were forced to turn on when you toggle brights.

  4. #4
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    Default Re: Another low beam headlight issue. Please help.

    Highs come on with lows from the factory on 04+. That is not your issue.

    Check for power at the harness. I had a harness get hot once and it would intermittently lose contact. I replaced the harness and all was well.

    2007 Pontiac Grand Prix GT - Daily driver. ZZP 3" catted downpipe and intake
    1994 Dodge Stealth - Currently being revived. Modded

  5. #5
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    Default Re: Another low beam headlight issue. Please help.

    Well after I took the splice off the the two wires the low beams won't even light up with brights. Which harness? Do you have a link for one?

  6. #6
    I live here. stealthee's Avatar
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    Default Re: Another low beam headlight issue. Please help.

    The plug in that the bulbs themselves plug into.

    2007 Pontiac Grand Prix GT - Daily driver. ZZP 3" catted downpipe and intake
    1994 Dodge Stealth - Currently being revived. Modded

  7. #7
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    Default Re: Another low beam headlight issue. Please help.

    Even though they seem fine?

  8. #8
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    Default Re: Another low beam headlight issue. Please help.

    Check for power there, then work backwards. Find out where you lose power at and go from there.

    2007 Pontiac Grand Prix GT - Daily driver. ZZP 3" catted downpipe and intake
    1994 Dodge Stealth - Currently being revived. Modded

  9. #9
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    Default Re: Another low beam headlight issue. Please help.

    I im not getting any power from the relay. And have changed the relay.

  10. #10
    I live here. stealthee's Avatar
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    Default Re: Another low beam headlight issue. Please help.

    Are you getting power to the relay? Are you sure you checked/changed the right relay?

    2007 Pontiac Grand Prix GT - Daily driver. ZZP 3" catted downpipe and intake
    1994 Dodge Stealth - Currently being revived. Modded

  11. #11
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    Default Re: Another low beam headlight issue. Please help.

    I'm 100% positive relay has been changed. I'm also positive the relay isn't getting power. #35 hdm module

  12. #12
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    Default Re: Another low beam headlight issue. Please help.

    So of relay isn't getting power where do we go from there ? I'm in the same situation also

  13. #13
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    Default Re: Another low beam headlight issue. Please help.

    So I thought about hot wiring a dummy switch into both lights to limit power to the outside light. While splicing the high beam back to the low beam. So that I can keep high beams on, and use the two dummy switches to toggle the "actual brights" if that's making sense to anyone.

  14. #14
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    Default Re: Another low beam headlight issue. Please help.

    Could this be a bcm issue?

    No more GP 04 Impala SS Indy:
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  15. #15
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    Default Re: Another low beam headlight issue. Please help.

    How could I check? I've worked in a variety of cars and tbh this is the weirdest problem I've ever worked on lol luckily local law enforcement was nice the other day and let me go with a warning!

  16. #16
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    Default Re: Another low beam headlight issue. Please help.

    For the time being you could actually put your high beam bulb in your low beam part of the headlight and just keep your headlights on high beam, but they will be "muted" due to the cover part of low beam lense. I did that when my HDM module crapped until I could get a new one.

    2007 Pontiac Grand Prix GT - Daily driver. ZZP 3" catted downpipe and intake
    1994 Dodge Stealth - Currently being revived. Modded

  17. #17
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    Default Re: Another low beam headlight issue. Please help.

    I'll definitely try that for the time being, thanks a bunch!

  18. #18
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    Default Re: Another low beam headlight issue. Please help.

    So how to I get a new bcm? Should I just go to the dealership?

  19. #19
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    Default Re: Another low beam headlight issue. Please help.

    Could it be the headlight switch itself in the column? No power to the relay, that would be where I start before the BCM.


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  20. #20
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    Default Re: Another low beam headlight issue. Please help.

    I replaced the headlight switch already. Bcm is there only thing I haven't touched

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