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Mike S.
Mike S., ASE Certified Technician
Category: Mercury
Satisfied Customers: 7568
Experience:  ASE certified
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1998 grand marquis head lights will not turn off even with

Customer Question

1998 grand marquis head lights will not turn off even with fuse removed
Submitted: 2 years ago.
Category: Mercury
Expert:  Mike S. replied 2 years ago.

Which fuse did you remove? Does this have daytime running lights?

Expert:  Mike S. replied 2 years ago.

Remove the circuit breaker #12 in the I/P fuse panel, then let me know if they go out now.

Customer: replied 2 years ago.
car is not here right now
Expert:  Mike S. replied 2 years ago.

Ok, but you can still answer 2 of those questions, can't you?

Which fuse did you remove? Does this have daytime running lights?

Customer: replied 2 years ago.
i removed all fuses that had anything to do with headlamps one at a time.lights will only shut off when i unhook battery . yes it does have daytime driving lights
Expert:  Mike S. replied 2 years ago.

Ok, when you get the car back, unhook that circuit breaker and let me know if they go out then.

Customer: replied 2 years ago.
where is the breaker
Expert:  Mike S. replied 2 years ago.

circuit breaker #12 in the I/P fuse panel

Customer: replied 2 years ago.
i am quite sure i did that,but wiil try again when i get the car back tomorrow
Expert:  Mike S. replied 2 years ago.

Ok, but you never mentioned it.

Customer: replied 2 years ago.
hey mike ,i removed the breaker but lights do not go out
Expert:  Mike S. replied 2 years ago.

Ok, leave that circuit breaker out and go back and remove all the lighting fuses again and leave them out. There are the fuses in the I/P fuse panel, the fuse #4, 13 and 8. Let me know if they go off now.

Customer: replied 2 years ago.
thanks mike will try
Expert:  Mike S. replied 2 years ago.

ok

Customer: replied 2 years ago.
hey mike i finally have car ,removed fuses ,lights still on
Expert:  Mike S. replied 2 years ago.

So you have all of the fuses out and the circuit breaker?

Expert:  Mike S. replied 2 years ago.

before I forget, here is the wiring diagram,

Customer: replied 2 years ago.
Expert:  Mike S. replied 2 years ago.

Somehow then the multifunction switch is getting power. Just to be sure you have pulled the circuit breaker #12 and these fuse in the I/P fuse block, 4,5,6 and 13 and also the fuse #6 in the engine fuse block?

Expert:  Mike S. replied 2 years ago.

If so, can you see which wire feeding the multifunction switch has power, the orange/white or gray wire?

Customer: replied 2 years ago.
hey mike, when i pulled #6 on the engine fuse block the lites went out
Expert:  Mike S. replied 2 years ago.

that goes to the daytime running lights module. Put all of the other fuses and circuit breaker back in and see if putting in and pulling out only this fuse #6 in the engine compartment fuse block causes the lights to go on and off.

Customer: replied 2 years ago.
hey mike ,yes it does turn them on and off
Expert:  Mike S. replied 2 years ago.

Ok, then it has got to be a problem with the daytime running lights and most likely either the module or, let me get the wiring diagram for that and see if there are any tsb's out on that before I condemn something without being able to test it.

Expert:  Mike S. replied 2 years ago.

Do you by any chance have a scan tool that can check the codes in the bcm and any other module?

Expert:  Mike S. replied 2 years ago.

Are both the high beams and low beams staying o? Can you see? Hook back up the fuse #6 and see if you can switch between high and low beams ad they are both staying on. Also if the high beam indicator on the instrument panel comes on.

Expert:  Mike S. replied 2 years ago.

Hook everything back up and then disconnect the daytime running lamps control located on the radiator support at the center of the vehicle and see if the lights go out now.

Expert:  Mike S. replied 2 years ago.

That control may be very hot so be careful if you have to touch it. Maybe pull the fuse , let it cool down, disconnect it, then put the fuse back in.

Expert:  Mike S. replied 2 years ago.

Here I found a test,

Expert:  Mike S. replied 2 years ago.

What happened when you disconnected that control?

Expert:  Mike S. replied 1 year ago.

Did you ever get this fixed or not?