I have a 1983 240d and the wipers only work on high. They won't go back to the bottom of the windshield unless I'm lucky enough to turn them off when they are at the bottom.

Do you think it's the motor, switch or relay?

Thanks.

Pete

The wiper motor is a 2 speed, 2 winding motor.

Low speed winding handles intermittent, low speed, and parking
High speed winding is just the high speed

I would suspect the motor - either a bad winding or bad connection in the low speed circuit. Could be the parking switch as well.

I would check at the connector in the engine bay for voltage - socket side.
Pin 3 is ground
Pin 1 is constant hot (when key is on) for parking switch
Pin 4 should be hot when in pos II (low speed)
Pin 6 should be hot when in pos III (high speed)

__________________
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2014 ML350 Bluetec (wife's DD)
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both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

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1987 300TD sold to vstech