Question about 2005 Mercury Grand Marquis

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I have the intermittent headlight problem. I changed out the headlight switch and that did not work. The car does have the auto headlights, and I was wondering if it could be the sensor on the back of the rearview mirror? Or whatever other suggestions you have. Thank you!

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Try replacing the multi function switch on the column

Posted on Apr 14, 2011

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  • Mercury Master
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Yes this is a possibility that the auto dip switch sensor or the circuit can be faulty. So flash a torch to check if the auto circuit works or flip to manual mode to check if the headlight relay works.
Make sure that the contacts are clean, the holders are good , the ground connections are good.

Posted on Oct 11, 2010

  • Gayle
    Gayle Aug 28, 2014

    If you have a 1999-2011 Mercury Marquis, Mercury Marauder, or Crown Victoria, and your headlights and or tail lights don\'t work, Ford just finally extended the warranty on your LCM (Lighting Control Module) for free - both parts and labor and will install a new one for free! Ford has extended the warranty to 15yrs/250,000. Must be done at Ford and the fix is free. Call your local Ford Dealer and tell them you need to make an appointment because your lights don\'t work and Ford has extended your warranty on the LCM. Tell them it is the Customer Satisfaction Program 14N01. Have your Vin number ready as they will ask for it. If they act ****** ask to talk to the manager or tell them to call Ford Motor Company and ask them or you can call Ford yourself. We just had ours done on 8-12-14 in Scottsdale, AZ. If you have a 99 you better get there before Oct. 14th, 2014 as it is a 15 year warranty.

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