Mercedes-Benz W204 rear wiper malfunction
220 CDI
Mercedes-Benz W204: why does the rear window wiper wipe continuously or stay on?
The cause can be a faulty relay in the boot fuse box; replacing the relay fixed the fault. In the S204 estate the relay is on a circuit board behind the hatch in the trim on the right side of the boot.
Mercedes-Benz W204: why does the rear wiper wipe when I engage reverse?
It is a normal function: the front wipers are on automatic or intermittent, in which case the rear window is wiped when reversing. Switch the wipers off before reversing and the rear wiper will not move.
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