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03 grand prix headlight relay

Where is the HDM relay for the headlights on an 03 grand prix. I looked in the fuse block under the hood and its not there

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  • Cars & Trucks Master
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There is one for each headlight at the back of the headlight.

Posted on Nov 07, 2012

  • Scott Pillow Nov 09, 2012

    Thanks ..but my problem turned out to be the multi function switch....

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SOURCE: 2003 Seville STS low beam headlights don't work

ya its is prolly the bulbs, open your hood. look behind your headlamps, some have covers for the low beam and high beam. if there are covers turn on your high beams so you will know which bulb is your lowbeam. if you can unplug them. after cover is removed and you can acces the bulbs. they either twist out, lefty lossey. or they have little metal retainers that you have to move a certian way before you can swing the retainer out. its like a door you just have to unhook the proper side of retainer and the other side will be hinged. use a flash light and look at it close. good luck

Posted on Jan 29, 2009

SOURCE: 1999 GMC Suburban DRL Work - Headlights/Highbeams Do Not

go to autozone the can help you if you have one they do a lot of things fore nothing including clearing codes

Posted on Feb 21, 2009

emissionwiz
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SOURCE: No low beam headlights or driving lights?

check the head light switch for burned connectors

Posted on Aug 31, 2009

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SOURCE: 2002 Pontiac Grand Prix GT headlights no power

clean the computer lead interface. my buddies car did the same thing, we cleaned the computer leads with a good eletronic spray cleaner and it fixed the problem.

Posted on Dec 30, 2009

  • 3 Answers

SOURCE: 1997 pontiac Grand Prix headlights don't work

A possable culprit may be your High / Low or dimmer switch. All the power to your lights are controled through that switch.

Posted on Jan 19, 2010

Testimonial: "It appears that is the problem, the book says to remove the steering wheel to remove the switch. I broke the wheel and now I'm in deep Do Do."

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How much does it cost to repair a HDM module on a 2007 Buick lacrosse


  • Subject of a RECALL so free
  • http://www.dealerrater.ca/recalls/Buick/LACROSSE/
  • 2007 Buick LaCrosse Recall Item Affected: EXTERIOR LIGHTING: HEADLIGHTS Date Announced: 08-14-2015 Description of Recall: General Motors LLC (GM) is recalling certain model year 2007 Pontiac Grand Prix, 2006-2009 Buick LaCrosse, 2006-2007 Buick Rainier, Chevrolet Trailblazer, GMC Envoy, 2006 Chevrolet Trailblazer EXT, GMC Envoy XL, 2006-2008 Isuzu Ascender, and Saab 9-7x vehicles. In the affected vehicles, the headlamp driver module (HDM) may overheat and fail, causing the headlamps and daytime running lights to not illuminate. Action Need To Fix It: GM will notify owners, and dealers will replace the HDM, free of charge. Interim notices were mailed to owners on September 2, 2015. Dealers will install a new HDM Service part as an interim repair. Owners will receive a second notice when remedy parts are available. Owners may contact Buick customer service at 1-800-521-7300 or Pontiac customer service at 1-800-762-2737. GM's number for this recall is 14291. FIND YOUR LOCAL Buick Service Centre
  • Buick Lacrosse Fires Caused by Faulty HDM Module? ' R.J ... https://rjhillconsulting.wordpress.com/2014/07/23/buick-lacrosse... 2014-07-23 · On 7/2/15 my 2009 Buick LaCross fuse box caught fire, I have since then learned that it began in the HDM module. There is a Technical Service Bulletin for ...
  • What is a Buick hdm module - Answers.com www.answers.com > ... > Pontiac > Pontiac Grand Prix > Grand Prix SE It is the headlight drive module. It is used for daytime running lights and low beam operation. It works in conjunction with the light sensor on top.

  • Buick Lacrosse Fires Caused by Faulty HDM Module? ' R.J ... https://rjhillconsulting.wordpress.com/2014/07/23/buick-lacrosse... 2014-07-23 · On 7/2/15 my 2009 Buick LaCross fuse box caught fire, I have since then learned that it began in the HDM module. There is a Technical Service Bulletin for ...
  • What is a Buick hdm module - Answers.com www.answers.com > ... > Pontiac > Pontiac Grand Prix > Grand Prix SE It is the headlight drive module. It is used for daytime running lights and low beam operation. It works in conjunction with the light sensor on top.
  • Buick LaCrosse Recalls DealerRater

    May 23, 2016 | Buick Cars & Trucks

    2 Answers

    Why Headlights won't turn on ?


    Turn you switch on and check for !@V at the headlight sockets if 12V is there replace builbs. If still don't work look for bad ground.

    Aug 10, 2014 | 2006 Buick LaCrosse

    1 Answer

    I have no low beam headlights. already checked bulbs, fuses, relay and dimmer switch. can you help?


    Before you replace the #46 HDM relay (in the fuse block under the hood) try exchanging it with the #45 cooling fan relay and see if your low beam lights work. If they do, the HDM relay (actually solid state module, not a relay) is bad.

    Jul 30, 2014 | 2004 GMC Envoy

    1 Answer

    When my 2007 Grand Prix is parked and is not started at the time the headlights keep coming on and off. Almost like someone is clicking the key. This in turn causes the battery to drain. This happens at...


    I wouldn't hesitate to replace the HDM module. Which is a fancy word for the headlamp relay. It is in the fuse block under the hood and on the passenger side. It will be labeled HDM module I have had these do some crazy things, I've replaced enough of them that any time there is a crazy complaint involving the headlights it's the first thing I replace.

    Nov 27, 2012 | Cars & Trucks

    1 Answer

    Headlight-prolems-


    Your question simply said headlight problems. So I am going to assume, since it is a 2004 model, that your low beam headlights quit working. If that is the case, here is a possible solution. In the fuse box under the hood,, you will find what looks like a relay. It will be marked HDM #46. Swap HDM #46 with HDM#45 and see if the low beams come on. If they do come on, you need to replace HDM#46 with a new one, which you will probably have to get from the dealership. Be sure to swap the two back in to their original positons because HDM#45 controls the cooling fan.

    Dec 06, 2010 | 2004 Chevrolet TrailBlazer

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    2007 Buick Lacrosse low beam headlights both went out at once. Doesn't appear to be the bulb. Also checked the fuses under the hood and those both appear OK too.


    The relay under the hood may have gone out. We had the same problem on our 2007 Buick LaCrosse CX. The bulbs were fine, high beams worked, all turn signals and everything except the low beams turned on. Turns out the relay had gone bad.

    Sep 07, 2010 | 2007 Buick LaCrosse CXL Sedan

    1 Answer

    The Saturday before Easter I was doing last minute shopping,when i got in the car to leave my headlight wouldn't work.The parking lights and high beams work, I changed the bulbs that didn't work. I got in...


    Try temporarily swapping #45 Cooling Fan relay and and #46 HDM relay in the under-hood fuse block, and see if the low beams come on.

    The one originally in the HDM #46 socket is bad. That relay is actually is a solid state module, not a conventional relay, and will cost you anywhere from $25-45 at the dealer.

    HDM = Headlight Driver Module

    Also known as a solid-state relay, since instead of relay contacts and a coil, it uses a power switching transistor capable of running the headlights (and the fan clutch in #45) at less than 100% power, to provide daytime running lights, and control the fan clutch engagement for the engine cooling fan.

    Thank you for using fixya and be safe.

    Apr 16, 2010 | 2006 Chevrolet Trailblazer

    4 Answers

    2006 grand prix low beam headlight do not work, high beams work fine?


    I'm having the same issue. I have changed the bulbs and fuses. I can't find a relay but I don't think that is the issue. Some other people have suggest the Dimmer Control Switch. I am working on that. Please let me know what you find out.

    Jan 26, 2010 | 2006 Pontiac Grand Prix

    1 Answer

    Headlights quit working,all other lights work,91 grand prix.Is there a fuse for the headlights?Can't find one under the dash or hood.


    alright here is the fun part... look under the coolant recovery tank. Its hidden under there. First check your switch out before you remove the tank. Let me know how it goes I have had the same problem.

    Apr 22, 2009 | 1991 Pontiac Grand Prix

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