Question about 2000 Mercury Grand Marquis

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Headlights, interiors lights and blinkers don't work. All fuses are good. Where else do I look?

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Hi,
If its not a fuse it is mosy likely a wiring problem. Best way to determine is to get a voltmeter like this ( http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dautomotive&field-keywords=volt+meter ) and test all of the receptacles with problems and see if they are getting power.

If the voltmeter shows that there is no power then you have a break in the wiring and have to either fix the affected area or re wire the whole thing.

If the Voltmeter shows that there is power then you might want to check the light bulbs and ensure that they are not burnt out. Evidence of this are discoloration in bulb and/or pieces of metal in bulb. These fragments can be heard if you gently shake the bulb.

Posted on May 29, 2011

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Posted on Jan 02, 2017

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Show me the right fuse to replace my headlights and blinkers


When you turn on the headlights or hazard lights, and when you use the turn signals you should hear clicks from under the dash. All the exterior and interior lights are controlled by the Lighting Control Module which is typically under the dash to the right of the steering column. If you do not hear clicks when you try the headlights and signals, and the interior lights do not work then the module is not operating. Your operator's manual will tell you which fuses are for the module.If you don't have the manual, you can find blown fuses with a fuse tester, voltmeter or by checking with an auto parts store like O'Reilly or Autozone, who will give you the info for free and may even help you find the fuses. Inspect the fuses and replace any blown fuses. If the lights still do not work, there is most likely a problem with the module which will need to be replaced, or there is a short in the wiring to the module from the fuses. It's possible something fell into the module and is shorting it out. If any electrical work was done, the work may also have shorted the wiring.

So the checking order would be: 1) Check the fuses, 2) check for wiring shorts and damage, 3) replace the Lighting Control Module. If you do replace the module, be certain to get the correct one for your car (the modules should look the same) and make sure the jumpers on the board are in the same positions as in your original module.

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Pontiac sunfire interior lights, horn and blinkers do not work


They are talking about the body control module, but I'm not sure they are right. The horn does not need the bcm to work. See diagram below. The horn relay is energized by the horn switch on the steering wheel. The switch also signals the bcm, but that is not used to power the horn.

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The turn signal does not use the bcm at all. The problem there may be the switch or the wire. See diagram below.



0996b43f80245517-jnh1p0frnkt3q2fbcpfimq4v-3-2.gif


The instrument lights DO REQUIRE the bcm, but can be rewired to bypass the bcm. The gray wire from the bcm in the diagram below powers the instrument lights. You can cut the gray wire and splice it to the brown wire from the multi function switch. Find the brown wire coming out the bottom of the steering column, skin some insulation off the wire and verify it has 12 volts when the parking lights are on. Do not cut the brown wire--just attach the gray wire to it. You will not be able to dim the lights, but they will come on.



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Aug 07, 2017 | 2005 Pontiac Sunfire

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