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The all-new GMT900 generation of the Silverado/Sierra arrived in the last quarter of 2006 as a 2007 model. It features a redesigned exterior, interior, frame, and suspension as well as a power increases on certain engines.

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Driver door window doesn’t work

Driver window getting no power to it

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Hi @pjwalls

Here's a link to the 2012 GMC Sierra 2500 power windows wiring diagram that may help.

Unfortunately to download it, you need to pay, but at least you can still view it for free.

Hopefully this is of some help.

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Thank you. Gonna have to trace the wires, fun, fun



Perhaps you can cut down the time spent looking by accessing the driver door switch harness connection and disconnect it from the switch and connect an Ohmmeter between terminals E & D on the harness plug and check if you get a resistance reading for the window motor.

If you do this proves the wiring from the switch to the motor but that's all.

If it tests open circuit, then you could access the wires at the motor and then prove which wire i.e. dark blue or brown is faulty by proving continuity from end to end for each wire.

Apologies if you know how to do this already

Good luck



Thank you, I will try that


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