urnamehere:
Did you ever figure out the problem?
I'm having a problem with my rear wiper as well. It's very intermittent, but sometime it'll wipe - no problem - when I hit the switch. Other times, it does nothing. When it does nothing, the rear wiper solvent pump still works though. I'm not sure if it's a bad motor, bad rear door switch, bad ground, etc.
Just this last time, I hit the switch and wiped 1/2 way and got stuck. Then it was making this clicking/knocking sound, even after I turned off the car and locked the doors. Very strange.
Was hoping someone has seen this before. It's pretty cold outside to be troubleshooting intermittent problems!