Question about 1998 Mercury Grand Marquis

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Replacing a lighting control module

I need to replace the lighting control module but don't seem to see it under the dash. Where is it?

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  • Mercury Expert
  • 284 Answers

You need to replace the headlight switch. It's all in one system.

Posted on Jan 19, 2013

  • Richard Meagher Jan 19, 2013

    I'm getting advise that the module is on the drivers side, Right of the steering column and above the gas peddle.

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Posted on Jan 02, 2017

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SOURCE: where is the turn signal flasher and brake light module

might be an inline fuse

Posted on Nov 29, 2011

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SOURCE: tail lights and dash lights don't work

You should check all the bulbs and your wiring circuit for fuses outside the fuse box, such as in line fuses.

If you need ECU chip tunnig, welcome to Allobd2.com

Posted on Jul 03, 2012

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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.

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It sounds like you have several different things going on.

For the interrior lights, are you sure that you don't have the interrior light switch on the map lamp assembly turned to the OFF position?

For the cigarette lighter I would unplug whatever it is that has been plugged into the cigarette lighter recently and check the 20 Amp fuse in the Central Junction Box located under the left side of the dash. It is marked "CIGAR"

For the check engine light, you will just have to scan your Powertrain Control Module for fault codes to find out the nature of the problem. Then you must diagnose the system that is failing before any repairs can be made.

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05 lincoln ls was in accident, hit on drivers side, airbag deployed from drivers seat, seat belt light on, engine light on, wrench light comes on and goes into limp home mode. Was told needed to throttle...


I have a 2004 LS V8 & do all my own work

I can understand the battery failed as it was
more than 4 or 5 years old

The converters would have had to be damaged
in the accident if something got under the car
& damaged the exhaust pipes,no other reason

The Gas Pedal is called a Electronic Throttle
Control Module,I'm looking at my wiring diagrams
for a V6 &v8. I don't see that as an issue

The Throttle Body is almost always replaced at a dealer
& seldom an issue either. Reason --When you have a really
bad COP Ignition Coil it spikes your PCM & the signal
comes back on the TPS Sensor on the throttle body &
the pcm looses throttle plate % & starts to cut out
fuel injectors

Bottom line ,not many people like working on Ford Products
& the dealer will really cost you dearly & with negative results.

I have seen many codes related to coils & never more than
one bad one,while it could happen

It sounds as though 80% of your issues have nothing to do
with the accident.

We own one of the most complicated vehicles out there
It has Jaguar Technolgy as well

I don't know if any testing or diagnosing was done on your car
or if what was done invloved a body shop,then off the a dealer
or local repair shop,but I don't get a warm fuzzy fealing on anything
but the battery

As long as your wrench is light you have codes to at least look at

The ETC Failsafe on the right bottom side if dash is a BAD COIL
as I explained above. You will drive up to 22 miles in hot weather

The PCM you can see & feel under & behind the glove box
To remove it you have to remove the box on pass side of engine
compartment that covers the Cabin Filter as the 2 harness connectors
ar there down low

I doubt the PCM Failed

Go to a local shop that likes lincolns & just have them find
the one bad ignition coil.
them it will only go 6 mph in failsafe. Unusable for now

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