Gentlemen,

I am in the process of trying to fix my drivers side power window. When I bought the car I noticed that the window was up and I could not roll it down with the switch, I took the door panel off and saw that the window motor had been unplugged. I hooked the connector up turned the car to 'On' and the window started rolling down all on its own, without me touching the switch. I have since disconnected the battery, removed the old motor and rails, and replaced the window assembly. When I reconnected everything the new motor still rolls down when the key is turned on. So I was forced to unhook the window motor connector and use alligator clips to reverse the polarity so the window would be up for the time being.

Troubleshooting began and trying to figure out why the brown window motor wire is turning into a hot when the power is turned on. Using the old window motor, I can watch and test the function of the power windows without having to reach in and fiddle with the motor I have remounted. Using my old motor, I noticed that when the key power turns on, the motor is continually spinning making Brown a constant hot.
- Using a test light on a hot, I noted that the Dark Blue (window up) was not functioning, as the test light would not change when window up was depressed. I replaced the switch and that now functions as intended by turning off the test light when depressed.
- Using a test light on a hot, I can validate that the Brown (Express-Down) works.I can hear the relay click and the test light will turn off for 5 seconds before re-illuminating.
- I have removed the 4-wire box from below the dash, just above the tranmission tunnel; I believe this to be the Express-Down Module. After I removed this the Brown (Express-Down) no longer functioned, however, the motor still was in a state on continually rolling down.
- With the Express Down Module (EDM) removed, the window up turns off the test light interrupting the power (much like pressing both up and down at the same time). With the EDM connected, the window up only causes the test light to dim briefly.

At this point, I can only stop the window motor from spinning by removing the Express-Down Module and pressing window up. As soon as I release the window up, the motor continues to rolls down. It doesnt make sense that the window motor is being supplied a constant hot over Brown as I was under the impression that the wires would be dead unless commanded either up or down, thus making either Dark Blue or Brown the power and the other the ground to roll up or down the window respectively.

Other information
- If I remove the window switch the window motor does not function. It is the same result as removing the 30A from the fuse block.
- Following the schematic here https://ls1tech.com/forums/stereo-el...r-windows.html I have not figured out how the Brown is a constant hot still with the EDM removed; I am perplexed and at a loss.

I am at your mercy as this is completely out of my skill set. Thank you for taking the time to read and provide assistance.

 

What's an EDM?

Follow the wire back to the fuse and you'll see a note - The brown is hot with the key in ACC, RUN, or when the Body Control Module is providing "retained accessory power". The details of how all this happens are on a separate schematic for that fuse.

 

Express Down Module, from what I understand.

I will be out of town today, but will try to run that down tomorrow.

Thanks

 

Ah. That module isn't "smart" enough to tell when the window is shut, so the power keeps on. The cutoff device is in the motor itself.