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Chuck, ASE Certified Technician
Category: Ford
Satisfied Customers: 2101
Experience:  33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
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Where is the power window relay on a 2000 Ford Mustang

Customer Question

Where is the power window relay on a 2000 Ford Mustang? Passanager window will go down but not up. Drivers window works fine.
Submitted: 7 years ago.
Category: Ford
Expert:  Chuck replied 7 years ago.

The relay for the drivers window is internal of the GEM module so if you have a bad relay you would have to replace the GEM.


Do you have a 12V test light or voltmeter to check with?

Customer: replied 7 years ago.
Yes. I have a test light, volt meter. I have checked the wire going to the window motor. I has a constant ground.
Expert:  Chuck replied 7 years ago.
Is this a coupe or convertible?
Customer: replied 7 years ago.
Expert:  Chuck replied 7 years ago.

Here are the wiring schematics for the window motors to help you out.


In the down position you will have power on the WH/BK wire on the right and ground is provided by the GEM on the other wire. It will reverse this in the other direction.







Customer: replied 7 years ago.

Is there a relay for the power window?

Expert:  Chuck replied 7 years ago.

No it is part of the GEM module,see the first page of the schematics. This is what works the one touch down on the drivers window.


Is just the drivers window inop or is both?

Customer: replied 7 years ago.
Just Passanager. It will go down, just will not go up.
Expert:  Chuck replied 7 years ago.

Ok look at the 2nd page of the schematics for the passenger window.


C and D is the power feeds and E and F is the ground.


As you can see everything goes thru the drivers master switch before it goes to the passenger switch except for the pink wire on pin 8 of the passenger switch.

So even if you use the passenger switch your ground still has to come from the drivers master switch.


When you press the switch to down you should have power on the YE/RD wire and ground on the RD/YE. It will reverse when you go up. Check this at both the drivers master switch and the passenger switch.(the GEM is not involved on the passenger motor) So you either have a bad switch or a broken wire.

Customer: replied 7 years ago.
Could it be a piniched wire?
Expert:  Chuck replied 7 years ago.
Yes it can. Start at the drivers master switch WH/YE and TN/LB . Should have power on the TN/LB and ground on the WH/YE in the down position and the opposite in the up position. Just use your test light to check it. Hook it to a power source first to check the ground and it will light when you touch ground.
Chuck and 4 other Ford Specialists are ready to help you
Customer: replied 7 years ago.
Thank You
Expert:  Chuck replied 7 years ago.
Thanks for using Just Answer.