Question about 2002 Mercury Grand Marquis
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Posted on Jan 02, 2017
10 year old remotes go bad often, especially due to moisture retention.
Posted on Nov 28, 2008
Testimonial: "Thank you, yes both(2) remotes are bad. I found a testing machine at a local auto parts store, even with new batteries the remotes do not send signal."
check fuse 8 & 14 in dash apnel.
also 40 amp fuse in engine comartment fuse box
if all good, it is the driver door module that controls all these functions.
13C797 base part number Driver Door Module
remove dr door trim panel for access.
search ebay with base number, may get lucky
Posted on Jul 13, 2011
Hello fellow Grand Marquis owner...
Fuses 2 and 9 in the central junction box protect this system.
There is a thing called the 'Driver Door Module' (DDM) that controls both the things that you are having trouble with.
If you want to test this module, a voltmeter will be necessary. The wiring diagram is available from Chilton either in a manual (which you should be able to borrow from a library), or online (if your library has the ChiltonLibrary available to you... you'll need a library card).
On the module, check for +12 volts on pins 10, 11, and 22. Check for ground on pins 23 and 24.
Working with the diagram is definitely the way to go.
Good luck from Detroit, MI.
Posted on Nov 01, 2011
You have a bad ground,or corroded wire somwhere ,also check to see if battery connections are tight an have no crystal like corrosion building up on the positive and negative connection's if so remove and clean with a wire brush,screw both ends,black and red into battery and make sure they are tight,Master Mechanic at Chevy dealer,me.
Posted on Mar 17, 2013
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