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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 odd times. It can be parked in driveway and the headlights will go on and off. Not sure why this is happening. Was in the shop for 3 days and they could not find the answer.

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  • Cars & Trucks Master
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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.

Posted on Nov 27, 2012

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Posted on Jan 02, 2017

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SOURCE: 2000 grand prix day time running lights/blower not working correctly

Believe it or not, but it was a bad ignition switch. I the switch apart and found about 3 different and one in particular that were burned pretty bad. Must have been the circuit that controls the blower and DRL? Found the solution on another blog. I put a new switch on in about 1.5 hours. I does take a couple special tools, very small female torx sockets. Other than that pretty easy.

Posted on May 25, 2009

  • 27 Answers

SOURCE: Headlights won't come on intermittently 2005 Dodge Caravan

Quite possibly the switch, Dodge minivans also have a front control module located under the hood, it attaches directly to the underhood fusebox, if a switch doesn't fix it I would look there.

Posted on Jun 24, 2009

  • 1 Answer

SOURCE: 2007 jeep cherokee wont start.

I have the exact same problem - did you ever find out what was wrong?

Posted on Mar 23, 2010

  • 1 Answer

SOURCE: My 2007 Jeep Grand Cherokee

My man I know your pain... I have the exact same problem happening to me now... same make, year and model... I called a mechanic buddy of mine and he said I might have a "flat point" on my starter and if so this might happen intermittently... he suggested a replacement of the starter... But I think the other suggestion is also quite valid so I going to have my friend do both...

Posted on Mar 31, 2010

  • 1 Answer

SOURCE: 2007 Jeep Grand Cherokee won't CRANK - battery is fine.

What is the current status? I purchased a 2007 Jeep Grand Cherokee from CarMax in December, 2009. The first time it wouldn't start was the beginning of March. The dealership could not duplicate the issue. Happened again a month later, they said it was the wireless remote module and that was replaced. Couple months later, happened again. They said it was the key module. That was replaced. Friday night, happened again. I'm waiting for a tow truck Monday morning. Does anyone know the real underlying issue and the resolution?

Posted on Jul 11, 2010

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Down load a service manual for your vehicle from this website
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