Mercury Mountaineer electrical issue

ralmoyOctober 17, 2009

Hi all hope someone can help...my 2002 mercury moutaineer. All of a sudden on friday. The following stopped working...The instrumentement cluster is dead..The Windows all don't go down nor up, The sunroof is dead also and the Radio is dead...The headlights work but only when i turn them on by hand the automatic is not working. also seems all interior lights don't work. I checked all fuses in the passenger compartment fuse box next to the steering column under the dash...all fuses are OK...someone from a parts store said it could be a main fuse in the engine compartment...I checked all the fuse in the engine fuse box all seem fine...someoone suggested it is a relay or a module...the only thing i cound narrow down was what is called a PTEC relay...but can't tell if it bad because its a black box that fits into slots like a fuse in the fuse box in the engine...any ideas...Thank you!

Thank you for reporting this comment. Undo
jemdandy

Its my guess that you lost a major ground connection, a connection that is common to the items that quit. You'll need a wiring diagram and connector list to chase down where all these are located, but for a shot in the dark, check out the engine grounding strap. I hope that the bad connection is not behind the intrument panel.

Another possibility is the ignition switch.

You may have to resort to chasing the circuits with a voltmeter, moving through the wiring maze until you find the location where the circuit is lost.

    Bookmark   October 17, 2009 at 5:03PM
Thank you for reporting this comment. Undo
john_g

Common to all of the affected circuits is the "Gem" (Generic Electronic) module. (On some it becomes the "FEM" Front Electronic Module). We can call it the GEM for now, the GEMs functions ultimately get split into several modules when Ford switches to the FEM/REM system, and off hand I don't recall what year the switch was made. The GEM controls the communication bus that the auto headlamps need to operate, and so does the radio and the instrument cluster. Diagnostics start by attempting to communicate to any and all of the vehicle modules through the ALDL, and this does require the factory level scan tool, the Ford IDS.

    Bookmark   October 17, 2009 at 11:42PM
Sign Up to comment
More Discussions
Radio antenna badly bent at car wash
I know this is going to sound really stupid but what...
africanboy
Brake fluid flush
I've had new brakes installed in the past. However,...
africanboy
too much pressure in cooling system
I have a 95 sable that lost heat about a year ago....
anggi821
Dying transmission question
I have a 2001 Honda Odyssey that has served me well...
catherinet
Cost to replace a 99 Buick head Gasket
My grandson 99 Buick blew a head gasket after the thermostat...
iggie
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™