GM Repair Problems? Ask GM Repair Expert Now.
Hi Mike, My name is***** will be glad to try to help. Test for power to the rear wiper motor plug when switch on using a volt meter or test light and also verify the ground lead tests good ground or close to 0 OHMS. Let me know
A common problem is poor grounding of the wiper motor. Try running a separate ground and see if this resolves your issue if you have power to the motor.
Let me see what I can pull up for diagrams... Click on this link for FYI as well
Black Gnd.Orange 12vGray 12 volts when switch is on (0 volts when off)Grn 0 volts with switch on or offPink/blk 0 volts (rear window ajar indicator wire)