I have a 1999 Ford F150 windows, wipers, dome lts, 4 wheel will not work. Pulled GEM it appears dry. Since it only happened at first after raining then would work after some time. Been 4 days no no work. The wipers and light come on for a second when close door or first turn key. Could it be something else fuses good and if jumper relays will work

check fuses

The gem can go crazy if exposed to water or if the battery voltage is too low. You can find wiring diagrams at the link below.

http://www.bbbind.com/free_tsb.html

replace the shift lock soleniod to get the shirter to operate again. Any Ford dealer can get this part for you

Those items are all on separate fuses.

The thing they do have in common is the GEM ( Generic Electronic Module ).

What is wrong with them ?

Hi,
Did you also check fuses on fuse panel in the engine compartment? GEM/ body module could be the cause. It is mounted on the back of the interior fuse panel. If you have had alot of rain in the past few days, you may have gotten water in the gem module and interior fuse panel. I would remove the 2 large connectors located on the bottom back of the interior fuse panel (they are held in with 2 10mm bolts) and see if there is water present. If there is water then you will need to replace the fuse panel and gem module that is mounted to it. But first fix the water leak which is most likely the windshield or cab visor if you have one installed. If you don't find wet connectors then the gem/ body module is a safe bet since it does control all the things you mentioned.
Hope this helps

It could be the GEM, Generic Electronic Module IF
you have a speed dependant interval wiper whre the interval changes as speed changes and
your "One touch" down driver window feature does not work. If passenger window does not work, it is not GEM. Is lockout switch on driver door off?

go to car-part.com for used part. look on page with asterisk for lowest price.
new - tascafordparts.com

wiper


power window

For starters, do you have brake lamps? The shift lockout is controlled by the brake switch. As far as the others, yes it could be the GEM (generic electronic module) some of these vehicles have water intrusion problems that leat into the fusebox and GEM which is located on the back of the fuse box. If you can look at the fuse box inside the vehicle and if you can see the back, look for corrosion which is a sign of water.

i just had the same problem with my f 150 ( 1999), my wipers, washer fluid pump, dome light, door chime stopped, I went thur the manuals, Checked appropated fuses, even changed wiper motor, (nothing worked) out of much internet checking, talking to mechanics, I got frustrated, I started pulling all the fuses under the dash,, I pulled # 15 ,a 5 amp fuse, which has nothing to do with the wipers eletronics, it was a good fuse, when i put it back in, everything came back and working fine. nearest i can figure it was either loose or a dirty contact.

#15 fuse (5 amps) on my box is for : stop lamp switch,( speed control,brake shift interlock,ABS, pcm module inputs.gem module,RABS test connector)
this was just blind luck, maybe it will help you.

2 possible problems one might be the ignition switch is not powering up those components,the other might be the gem module its like a body control module and it runs those components

sounds like you have a problem with the gem module, (generic electronics module). This is a common problem with most ford trucks and suv's. you can find it behind the knee bolster on the drivers side under the dash.... hope this info helps.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jonathan_3a3c556b4b17d1d2