Question about GMC Sierra

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I'm looking for a good electrical schematic for the power windows on a 1988 GMC Sierra 2500 I have my Chiltons book however the schematics do not include the relays for power doors / windows

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Try this research site. Site requires a log-on. Just get a library card from your local library and enter the code. Great info site as well as wiring schematics!

http://arrc.epnet.com/autoasp/index.asp?sid=171714302&uid=s9210915.main.autorefctr

Posted on Oct 17, 2009

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Posted on Jan 02, 2017

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Buy a Hayes Book or Chiltons for your model. Schematic drawings are in it. Hayes runs around $25 can be found or ordered at most local auto parts stores. I always buy one every time I purchase a new (to me) vehicle , sooner or later I've had to use it. Good Luck !

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Driver's window


The wiring diagrams for your 2003 GMC Sierra power window circuits are copyrighted material and cannot be posted here. However, I can describe the driver's power window circuit to you.

Battery voltage is provided to the driver's window (master) switch via the ORANGE wire at PIn #2 on the switch connector which comes from the 25 Amp Left Window Circuit breaker located in the fuse block on the left side of the dash.

There is a logic module located inside of the master switch which controls the "Auto Down" feature for the driver's window. When the switch is operated in either the "UP" or "DOWN" position, power and ground is supplied to the window lift motor via the BROWN wire (Pin #1, Connector 2) and the DARK BLUE wire (Pin #3, Connector 2) Thease wires will switch polarity dependin on whether the switch is commanding UP or DOWN.

The schematics show that the ground circuit for the driver's window motor is supplied internally by the driver's window switch module. It is most likely grounded inside the door panel itself - the schematics do not specify. To check for ground, you can test continuity to ground on BOTH the BROWN and the BLUE wires by back-probing them with the switch electrical connector plugged in and the window control switch in the NEUTRAL position. They should both have ground.

When the switch is operated, one will remain ground while the other switches to power.

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