Originally Posted by
Egyorko
Hi onehundred80, I would have suspected the MF switch as well but it doesn't seem to be the culprit. With the MF switch entirely removed from the BCM harness (C3 connector physically removed), the wipers still operate. If the wiper function worked as designed then 0 volts (open circuit) at Pin 65 of the BCM should result in the wipers being (remaining) off.
There is a direct line of power fed from the fuse box, possibly the MF switch controls the cycles of the wiper motor by changing circuits in the BCM, the motor gets its instructions from the BCM.