Have any of you Chrysler techs ever seen a failure mode where the rear window washer comes on by itself and stays on? I traced mine back to the fact that pin 50 on the BCM connector is staying grounded all of the time. The part I don't know how to troubleshoot is the interaction with the climate control subsystem in the console. Is there any way to know if it has failed and is somehow commanding the BCM to run the rear washer? Or is it more likely that the BCM pin 50 driver has failed shorted to ground?
One interesting thing is that when the motor first failed on, even shutting down the engine wouldn't stop it. I had to unplug the pump connector to kill it. I then had a local garage look at it and they couldn't find the problem, but said they thought the pump was bad as it didn't run when they plugged it back in (it had been several months since the failure). That was a couple of months ago and today it all of the sudden came on again. The difference is that this time when I shut off the engine, it would quit. I'm certain before it ran even with the engine off, which seems hard to believe looking at the way the system is wired (unless the ignition switch is also faulty and letting power through it in the off position).
In addition, my front washer quit working recently. I haven't had time yet to work on that, but was reviewing the manual this evening. I'll check the washer motor itself first, but assuming that is OK, how hard is it to get to the multi-function switch connector to check the washer switch itself? The FSM diagram just shows it being on the steering column, but isn't really clear how to get at it. I assume this procedure is somewhere else in the manual, but I haven't yet found that section.
Matt