Wipers not parking

[jrcampbe]

Hi everyone! I've tried searching and can't find a post related to this.

My wipers have suddenly stopped returning to park position. They work, intermittent even works, but when I turn off the switch they stop immediately and in the middle of the windshield.

Can someone explain how the motor is supposed to know when to stop? Do I need a new motor or can this be repaired?

Thank you!

Jim

[raueda1]

See attached wiper diagram.  The park switch contact is internal to the motor mechanism unless MB is different from every other car out there.  Here's a good, generic explanation of how wiper motors work:
http://www.gomog.com/BLAIR/tech/electrical/wipers/2speed/2SpeedWiperMotor.html

With a voltmeter you should be able to puzzle it out.  I suspect you're looking at a new motor.  Good luck!