My tail lights not working but my headlights and break lights are. 1999 grand marquis

Asked by kenn_white Mar 27, 2015 at 08:38 PM about the 1999 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

I checked all of my fuses and bulbs and wires

11 Answers


It's probably your Lighting Control Module LCM. Factory recall should have been done, Ford will pay for some repairs. Get a rebuilt one from EBAY.

14 people found this helpful.

Where is the LCM

14 people found this helpful.

It's under the dash, above the streeing column. Kinda hard to get at. Try Googling it. I paid someone to do it because of my neck.

11 people found this helpful.

Why don't my brake light work on a 2005 Grand Marquis

16 people found this helpful.

Headlight switch is bad 60 $ at parts store 20 min fix. Easy

5 people found this helpful.

I have a 2005 Grand Marquis Mercury I don't know why my tail lights won't work

23 people found this helpful.

Bad bulbs, blown fuse, bad ground at the bulbs, bad headlight switch, bad Lighting Control Module, Those are the posibilites, check the bulbs and look for corrosion first, as well as fuse.

1 people found this helpful.

I have a 2005 grandmarquis presidentual model all of my lights work except my tail lights what would cause that i have already had the light control modul e replaced and the bulbs and wiring are good could it be the lighting control on th left of the steering wheel

5 people found this helpful.

I am having the same issue. Physically, everything looks good, as far as fuses and wiring. I have not tried the switch. How would you go about checking that, or do you just have to buy a new one and see if it works?


Replace the tail light bulbs, make sure the sockets aren't corroded, check for grounding of the sockets, I don't think they rely on ground from contacting the body, must be a wire that grounds to the body somewhere. Grounds can get ya! Do the brake lights work?

1 people found this helpful.

If your car has autolights/lamps ingaged make sure there is NO debry, paper, etc. In the way of your vehicles photocell/amplifier assembly ... This is located in the upper instrument panel pad left of driver aka far left corner of dashboard/front windshield of the driver. Circled in yellow on photo

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