Question about 1988 Chevrolet Suburban
There rear window switch works by reversing power to the window motor. In the up position it will supply power on one wire to the window motor and ground to the other. In the down position it will supply power to the wire that was previously ground and ground the wire that was previously power.
With the switch removed but still plugged in back probe all the wires with a test light. One should have power to it all the time and one should be grounded all the time. The other two wires are the ones you want to look at. With the switch in the down position. one of the two wires left should have power and the other should have ground. Since the window went down I don't suspect there will be an issue with this part of the switch. In the up position there should be power on the wire that was ground when the switch was up. There should not be power on the other wire, which I suspect there is. If the other wire has power on instead of being grounded than we know the switch is bad. If the other wire does not have power on it than the next step will be to tap the window motor with a screwdriver while holding the switch in the up position. If the motor rolls the window back up than the motor has gone bad.
Make sure the key is in the run position when you check this out.
Posted on Sep 29, 2010
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Posted on Jan 02, 2017
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