I read about this issue earlier but never experienced the problem until I had my TIPM replaced due to a bad headlight driver circuit. Are the wipers controlled in any way by the TIPM or is it just coincidence?
The wiper switch is a MUX (varies the voltage depending on switch position) circuit that goes to the cluster. The cluster busses the switch position request to the TIPM/FCM/PDC (depending on the MY) and the TIPM turns on the power to the wiper motor.