Mike Murphy

I thought I would post this issue on the forum to see if anyone else has experienced it. I have a 98 Ford F-150 XLT Lariat. I am having an issue with the power windows functioning intermittently. I have narrowed the issue down to the ACC Delay Relay being closed/open intermittently. According to the electrical diagram I have found online this relay is controlled by the GEM. Which as I have discovered can fail due to moisture leaks through a badly sealed window. I also have determined that the left power window motor is not functioning as I have applied 12VDC directly to the motor in both polarities and no movement what so ever.

My question is, could a bad power window motor be causing the GEM module to intermittently energize the ACC Delay Relay? Or is looking looking like dual failure of the GEM module and the power window motor?

texasedition

So your getting no power to the switch at all?

Mike Murphy

I am getting power to the switches when the GEM module energizes the ACC Delay Relay. When that relay is on the passenger side window works from both left and right side switches. The left window is inoperative at all times.

texasedition

Ok. So no matter what the left window doesn't move?

Mike Murphy

That is correct. The left window does not move no matter what.

tansupercrew

If the motor doesn't work with power and ground applied correctly, replace the motor and recheck. Simple.

Mike Murphy

I thank you for your time and effort to provide an answer but it does not address my original question. As the Left Power Window motor is obviously bad, is it possible that this bad motor be causing my issue with the Generic Electronic Module cycling the ACC Delay relay.

Meaning, if I replace the the power window motor, what is the likelihood of the GEM issues going away?

bobkyle2

Well, Your going to need a motor no matter what.

If you want to visually inspect your GEM module its easy, Just take it out and open it up. There are 2 or 4 clips holding the top on, If there is moisture problems you will see it. I just had an issue on my 02, And i chased it forever. I need a GEM module and fuse panel. Both was bought from a salvage yard for 50 bucks.

TheKing1985

My GEM is gonna need to be replaced too, found a leak in the windshield and its been leaking right on top of the GEM.

Will any GEM work from our generation trucks? Or do you need to pull one out of a truck that has the same options, like 4x4 power windows/locks ect...?

krazyt

I'am having strange problems with my 1999 F150 XLT 2wd, 5.4 motor, with 210,000 miles on it.
Battery will go dead in about 8 hrs just setting sometimes. Wiper's not working sometimes, odometer going nuts. The last time I drove the truck, it sounded like the starter was try to engage in park and neutral with truck running.