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I wouldn't be so sure it's a bad motor. There are several limit switches in the tailgate that have to show made before the roof will be allowed to move. You really need a GM computer to work on one to be able to see in real time what switch is and which one isn't made causing the fault.
It is part of the throttle body. If you want to replace the throttle position sensors. You will have to replace the throttle body as a unit....Note: There should be two of them in your scan tool data screen.
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check the fuse/relay. if it is neither of these check the switch with a multimeter. If you can hear the motor trying to move the glass when you try the switch it may be the regulator needs attention. It may be the motor needs to be replaced.
check fuse and relay along with the switch first then the regulator and motor afterwards. Replacing the small electronics is obviously easier than having to open up the tailgate to check the mechanics of the winedow.
Sounds like a bad connector in the main harness. You may have to pull the quarter panel trim to check it. You may also need a shop manual with wiring diagrams to know where to look.
The most common issue with strange acting or random function of a remote, IS THE BATTERY. Replace the battery in the remote before forcing anything or taking things apart. Good Luck!
I also have a 2004 GMC XUV. My gate would go down but not swing open. In trying to fix it, the gate then refused to go to the flat position.I have removed the cover plate on the gate and found the one of the
solenoids loose from its mounting. Resetting the computer by disconnecting both battery leads and holding them together for ten seconds worked to restore function to the gate going flat, but the swing still does not work. I believe it is a bad solenoid or motor for the bottem left latch pin.
the actuators have a white stem that sticks out of the bottom of them. if you push up on the ones on the driver side it will open the back hatch for you.
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