Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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This is a common problem caused by a failed wiper motor/module. The gray wire feeds power to the wiper switch from the motor and then when the switch is turned on, it sends voltage back on the pink wire to the motor as input for a command. When the switch is off, the pink wire should not have any voltage on it at all. If no voltage but wipers are on this means the wiper motor/module needs to be replaced. Let me know if you have questions, thanks.
I haven't heard of anyone fixing module themselves so I really have no idea what repair would consist of and do not have any diagrams of internal electronics.