Driver switch not working on passenger window.

[Skippy969]

I have an 85 GMC K1500. I'm working on the power windows and have run into a problem. The drivers side switch works for the drivers side, but not the passenger side. The passenger side switch does work for the passenger window. I tried jumping pink to tan or pink to blue with white stripe on the drivers switch and the passenger window still didn't roll down.

 

[gmbellew]

troubleshooting

 

[Skippy969]

Thanks,

I'll try the troubleshooting today, but another thing I noticed while looking around. The blue/white wire and the tan wire coming from the passenger switch have a tap wire coming off and going to ground. If they aren't grounded, the passenger switch doesn't work. I checked continuity from the driver door switch blue/white and tan wires to the same wires on the passenger switch and they have continuity.

 

[gmbellew]

Thanks,

I'll try the troubleshooting today, but another thing I noticed while looking around. The blue/white wire and the tan wire coming from the passenger switch have a tap wire coming off and going to ground. If they aren't grounded, the passenger switch doesn't work. I checked continuity from the driver door switch blue/white and tan wires to the same wires on the passenger switch and they have continuity.

maybe somebody has added relays or something to the system? extra trouble shooting steps in that case, I reckon.

 

[Scott91370]

I had this issue and need to post my fix in my thread.

On the wiring harness side of the plug I had a wire break off on both the driver's & passenger's sides. Sounds like you may have already rules it out though.

 

[Skippy969]

Update. I replaced the drivers harness and switch and it fixed the problem.

 

[Scott91370]

Do you know for sure which piece it was that did the trick?

 

[Skippy969]

Do you know for sure which piece it was that did the trick?

More than likely the switch.