Purchase a Haynes manual at Autozone or most auto supply storesthat covers your car. In the back are several wiring diagrams one of which will be what you're looking for. I have a 93 Ciera and use it alot.
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Click on the link for diagram. I couldn't get the whole diagram in one picture and make it readable. Is it just one window or all of them? There should be wiring harness on hinge side of driver door. Black wire with red tracer is voltage to master switch for power windows, goes hot with key on. the bottom black wire in diagram is chassis ground. You can use test light to check both voltage and ground.
In the diagram, the brown wire is voltage for power windows. Goes hot
when you turn on the key. Voltage comes from the power window circuit
breaker. The black wires in the middle of diagram are ground. Use a
testlite to check voltage on brown wire, key on. If the brown wire has
voltage, to check the black wire for ground, use a testlite between
brown wire and black wire. If lite comes on, you have voltage and
ground.
Here are two typical GM power window wiring diagrams, one older and the other a newer model power window wiring diagram, but these two diagrams should help you understand the circuit. Let me know if you require any further assistance.
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