I have a 2008 E320 Bluetec that I just bought. I'm having problems with the windshield washer. I continuously have 12 VDC at the windshield washer electrical connection which means the washer runs continuously if connected. Has anyone seen this before? Possibly a bad switch? Is there a relay in the circuit that might be frozen closed? When I got the car, the fuse was absent and the washer pump was locked up.

 

Problem went away when I cycled the switch off and on repeatedly.