[gforster]

Well here we go. There is a PTC (circuit breaker) in cav #9 under the dash it's a 6 amp and that should disable the wash motor. There is only one MUX lead going from the control to the Body computer which then drives the motor through that circuit breaker. I assume from the diagrams that there are certain resistances sent to the computer from each of the rear wiper/wash switches, but I have no specs as to what they should be. The control assembly can run it's own diagnostics and give you an error code but i don't know if it tests washer and rear wiper circuits. Sorry i'm not much help from here....