Question about 1999 GMC Yukon Denali

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Windows not going down with individual switches

I have a 1999 GMC Yukon with electric windows. The windows will go down with the driver master switch but not with the individual switches?

Also the lock out button for the windows do not work? I just had a dealer put a new motor in for the drivers side and all of the other windows worked fine prior?????

Any suggestions?

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If you told the problem to the dealer this should of been fixed take it back to him and tell him your not satisfide with the work that as been done if he his huming and aring tell him that you are going to see a trading standerds officer.. then go from there

Posted on Dec 30, 2008


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The passenger power window switches incorporate window up and down relays. The relay coil feed and supply sides are powered through the RAP fuse supply voltage circuit. The normally closed contacts of each relay is connected to ground. The load side of each of the relays are connected to either side of the power window motor through the power window up and down circuits. The up and down relay control circuits are connected to the normally closed contacts of the passenger window switch. These contacts are wired in series with the power window master switch, through the power window master switch up and down signal circuits and then to ground when the power window master is placed in the up or down position. This allows for the up and down operation of the passenger power window from the power window master switch. The center pole of the passenger power window switch is also connected to ground and will energize the relay when placed in the up or down position.

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The driver power window is unique from the passenger power windows in that it does not use window up and down relays. The driver power window is operated directly from the power window switch.
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By placing the left power window switch in the up position the polarity of the motor is reversed and the motor drives the window up.

Has circuit breaker for B+ power
• PWR WDO CB 25A (fuse block) (System power for left and right windows 2-door vehicles. System power for LF and LR windows 4-door vehicles)
• PWR WDO CB 25A (IP wiring harness junction block) (System power for RF and RR windows 4-door vehicles)

Could be passenger door switch .

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So if they are working from the individual doors then the wiring has to be good and the switch has just lost it's ability to route it where it needs to go.

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