HELP - strange electrical problem - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 10-31-2012
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HELP - strange electrical problem

The screenwasher pump on my SLK has stopped working after the car has been unused for a long time, although pushing the switch still operates the wipers correctly. The pump motor if fine, but the electrical feed to it has a strange problem. I've unplugged the two wires which connect to the motor. One is the earth, and the other has a voltage reading of 4.31v all the time, whether the ignition swich is on or off! Operating the screenwasher control makes no difference to this reading.

Any ideas? Does the screenwasher circuit contain a relay or electronc module of some sort, or does the feed to the pump motor come directly from the switch on the steering column? I'm thinking that if there is no module then I can connect a wire directly from the switch to the motor to eliminate any wiring fault between the two.

Last edited by mikevernon; 11-01-2012 at 06:34 AM. Reason: Clarification
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