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David Schmitz Posted on Oct 10, 2017
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2003 grand marquis ls door locks dont work seat power works and seat belt light or sound wont come on checked all fuses and some lication ever with key on accros the fuse connectors have no power

Soe of the fuse locations have no poer power

1 Answer

Kardoc

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  • Mercury Master 7,503 Answers
  • Posted on May 08, 2019
Kardoc
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Check the cables that come from the positive side of the battery. May have a bad fuseable link wire.

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Anonymous

  • 2 Answers
  • Posted on Jun 05, 2009

SOURCE: door locks 2003 grand marquis ls stopped working

check fuse

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2answers

2000 Mercury Grand Mar Quis LSMultiple things stopped working at same time

Changing a serpentine belt shouldn't affect any of the electrics. Changing a starter only carries a risk when disconnecting and reconnecting the battery before and after swapping the starter motor. Done correctly that risk is low.
So, No clock, no heater control panel, no rear view mirror compass and both power door locks don't work? Does the car still start and run normally? Do the power windows (if fitted) still work?
This still sounds like a fuse issue. How did you test the fuses? Fuses can look OK but still be 'popped'.Somewhere around 2001 some changes were made to the fuse box layout on that model. Is your dashboard fuse panel the smaller square 18 fuse panel or the larger, longer 32 fuse panel?
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All lights went out on 2003 Grand Marquis Ls

Check the fusible wiring link near the battery and fuse box. Sounds like it has burnt.
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Signal lights door locks clock ac fan and controls do not work

Those are five different circuits - and not all controlled by the key switch.
I would check for power at each circuit, starting with the fuses.
You could have a fuse or fuseable link causing some or most of the problems.
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The air bag light on my 2003 Mercury Grand Marquis LS Ultimate Edition blinks 3 times then goes out,then does this a couple more times,then stays on constantly.Any ideas?

There appears to be a pattern of premature failure of seatbelt pretensioners in the mid-2000s Gran Marquis, especially the 2005 model year. See carproblemzoo.com or NHTSA complaints. Ford dealer wanted $103 for diagnosis and $501 for replacement of the part.
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Door locks wont work

check if the batteries in key remote are good.
if good
nedd to reset your key by putting in the ignition just turn the dash lights on ...dont start the car and once the ignition lights shows on the dash board just press unlock and lock once ot twice until it locks and unlocks while u in the car. try that it had worked for me before should do for urs.
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Seat belt chime not working

I bet its a fuse. Look under your drivers side belly pan for a fuse box door. Pull the door open/off and look at the fuse diagram to see which one might be related to the seat belt and autol ock. Cross reference it and check the fuse to see if it isn't blown. If you dont see anything that relates to it or dont find any blown fuses, check the engine bay as often cars feature a second fuse box. Check that one for blown fuses as well. This is a very easy thing to do yourself, your randma could do it.
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