I have a 2010 E61 and the rear wiper doesn't park in the home position. Here are some details.

-I have had the rear wire harness rebuilt/fixed, but that didn't fix it.
-The wiper moves freely without significant friction when the glass is up
-I have played with just pulsing the stalk and holding it down and there is no difference.
-There isn't a pattern for when I release the stalk to the final position.
-After 3 or 4 rounds of running the wiper it will stop and not move (maybe motor overheating)
-Not sure were the relay/solenoid is, but would appreciate learning where that is.

Appreciate any help I can get.