2006 Pontiac Grand Prix LOW beams not working

Discussion in 'Domestics' started by Mikerizer, Oct 8, 2011.

  1. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    From a friend:

    "HELP! My 2006 Grand Prix's low beams (and daytime running lights) quit working! High beams and fog lights still work fine.
    We've checked the fuses, bulbs and the relay. Any ideas???"

    A new switch is quite expensive...I don't want to just throw $200 at it, without knowing for sure. What are some other possible culprits?

    Thanks, BAT!
     
  2. kev2

    kev2 wrench

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    underhood fuse box, fuse 3 and 4, it appears they are powered AFTER the low beam relay is energized, so probe for 12v with lo beams switched on...

    let us know any recient (before issue) work or repairs, the BCM controls the relay, ck eng light on?

    might want to see if low beam relay is same as other relays if yes try swapping to test
     
  3. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    Great ideas...thanks!
     
  4. NickD

    NickD wrench

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    Find a blown fuse is not comforting, vehicle lighting is from sten to stern, a short can be anywhere. DRL's are typically the high beam in series, plus you have a relay someplace. I would start off, well check the fuses of course, by checking all the bulbs. Occasionally when a heacl lamp burns out, the element supporting wires will short out.
     
  5. The old man

    The old man Hero Member

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    Just to get it clear as to what is happening, will the low beam headlights come on when you put the Multifunction Switch in the "Head" position on the multifunction switch.? Also the DRL won't operate if the emergency brake is on and the ignition switch is not in the "ON" position, according to Alldata. Why did they put the headlight swich in the Multifunction Switch? MONEY, that is why.
     
  6. kev2

    kev2 wrench

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    $.02.... 12v from fuse to an easily accessibly switch to the lamps, chassis ground.... was WAY to simple and inexpensive- KISS

    Ze new engineering mantra requires Make It Complicated* AND Hide It.....MICAHI



    *read unservicable and EXPENSIVE.....
     
  7. NickD

    NickD wrench

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    GM use to take that head lamp switch very seriously with over sized plated self cleaning sliding contacts and an extremely fast acting self resetting circuit breaker.

    But since then, someone decided it safer, even in bright sunlight to run the brights at a quarter of the illumination during the day time. And that super head lamp switch was replaced by a cheap point contact relay, with fast blow out fuses that don't reset, with even the BMC involved in some cars.

    Surprised with this problem, no one mentioned either the DRL relay or its module as the source of the problem. Maybe Jim can post a circuit diagram of what's in this vehicle.

    Yeah, on my made in China toy, DRL come on as soon as the ignition switch is turned on, but can kill them just by barely raising the parking brake a fraction of an inch. So that parking brake switch can also be the problem. With the ignition on, parking brake up a notch, turning on the head lamps in low beams should ignite the head lamps. Providing there isn't a small spec of dirt on the DRL relay contacts.

    When driving down dark curvy tree lined Wisconsin county roads, good idea to carry either a candle or a flashlight along, so you can see where you are going.
     
  8. Mary J

    Mary J Newbie

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    Confusion is always everywhere. and i agree.. carry a flashlight or candle..
     
  9. billj

    billj Hero Member

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    How about this idea. By the way this for real!
     

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  10. Jim Fairbanks

    Jim Fairbanks wrench

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    Hey Nick...here are some diagrams....should be a trouble shooting tree and 2 diagrams...hope they come through.....Jim
     

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  11. al daniels

    al daniels wrench

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    wow bill,high and low beams.very advanced.lol.
     
  12. NickD

    NickD wrench

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    This is an old thread, was this problem ever resolved? Dash indicator is independent of the BCM relay outputs, does that lamp flash on and off with the brights? Should indicate the BCM and multifunction switch is working, but maybe that flashram crashed.

    It's Memorial Day today, thinking about two uncles I never got to grow up with, and a couple of buddies that never came back. Got our boat ready, but raining all day today, wife is on call, so not doing much of anything.
     
  13. Mary J

    Mary J Newbie

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    Nope,the problem is still there.
     
  14. Gus

    Gus wrench

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    Wait a minute.....I am confused here.....Is Mary J jumping in on an old post with a similar problem, or is this person the original poster under a different name?

    I doubt the problem has been there for two years.....

    So what is the story Mary J?
     
  15. billr

    billr wrench

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    OP was posting "for a friend", this Mary J could be the friend. But still, what is the story???
     

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