I don"t know how this could even happen. I haven"t touched my windshield wiper relay, wiper control, or steering column, but now when I adjust the passenger side mirror, the windshield wipers come on???!!! 1984 300cd.

Please post model and year. Thanks

__________________


Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

On my 84 300sd the windshield wipers often take a swipe or
two when I first start the car. It's either 30 year old wiring
talking funny or maybe you're right, it's mysterious messages
from the great Mercedes Netherworld

It's not dangerous or really very annoying so I haven't even tried
to fix it. I think I've had the same thing happen as you with the
passenger mirror.

The electrical gremlin I had that was dangerous was the seat position
memory switch. It would just start moving by itself up--down--pushing
me into the steering wheel. Funny to the people in the car with me, but
I really could have had a wreck. Needless to say, I disabled that feature.

Jeff

__________________
1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end

I have the exact same issue with my car. If I move the passenger mirror switch in a certain position, the wipers come on for a few strokes. Sometimes this happens when I start the car or turn the A/C on via the PBU. Some times I want one swipe of the wipers with the switch but I get several. I can usually stop them by cycling the wiper switch a few times. Definitely sounds like a ground issue to me. I plan on checking the electrical wiring on the wiper motor at some point.

Let us know if you figure it out. I'll do the same.

__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

I had an issue a while back where the wipers in my 240 would just decide to wipe randomly, not caused by anything. It turned out that the switch for the wiper on the end of the stalk had some moisture in it. The moisture mixed with the little bit of grease in the switch, and it would make the wipers work automagically. I popped the end cap off the wiper switch and cleaned it out. After that the automagic wipers stopped working automagically.

__________________

I can see how moisture would do that. It basically shorts the contacts enough to trip the relay. However, I don't think the switch is the culprit, at least in my case. I replaced the whole stalk shortly after buying the car because the turn signal switch was no-op, but the wiper issue persisted.

I have cleaned every ground point you could imagine except for anything behind the hood cowl. I have not yet ventured in there.

__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

Many systems tie to two common ground points:
G101 (RH Front Fender, behind the headlight)
G102 (Behind center of instrument cluster)

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )

SD Blue:

Thanks for reply:

I recently replaced rt. headlight assembly along with rt. fr. fender. Ground wire not reconnected.


Tom

This may help several of my customers.
After connecting the ground and testing, please post your results.


Thanks

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Did that solve the problem?

__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

Sorry for the late reply:
Since discovering the wiper issue, the battery has died. Need to save up for purchase.


Tom