'94 E500:
Today out of the blue...the windshield wipers/washers and headlight wipers started coming on when the headlights are activated. Turning the lights off stops them.

Obviously, it's an electrical issue...probably a short somewhere. Any ideas on where to start looking?

Thanks

__________________
Glen Tokuhara
Beauty & the Beast and the wagon that could!

The right headlight wiper can feed-back into the regular wiper system. Try un-plugging the RIGHT headlight wiper motor or the washer motor with the piggy-back electrical plug.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks Doc...I'll check it out. Does unplugging/replugging "cure" it?

__________________
Glen Tokuhara
Beauty & the Beast and the wagon that could!

Won't cure but will help in diagnosis.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Ok...I fixed it...or at least, the problem is gone now.
I tried pulling the headlight connectors and washer pumps...no change.

I ended up pulling the #2 fuse for the washer/wiper system. Started the car and turned on the headlights. For an instant, the washer pumps came on then turned off. I replaced the fuse and everything is working properly.

Seems like there must be a relay that needed resetting...if it happens again, I'll dig a little deeper.

Thanks for the help!

__________________
Glen Tokuhara
Beauty & the Beast and the wagon that could!