100 Rear wash/wipe

[rob hod]

    Just wondered if anyone could cast some light on the following problem;

    I have an '88 100 avant 2.0E. The rear wash and wipe don't work.

    First I checked the wiper motor works. It does, both on the main supply
and on the 'park' supply.

    Then I checked the wiring through to the multiway connector near the
n/side rear light cluster. All OK.

    Then things got interesting. I decided to try substituting the relay
from my 87 coupe's rear wash/wipe.
    Still I had no luck. So as a double check on the relays I put the one
from the 100 in the coupe. The wiper got half way through its cycle and then
stopped. I substituted the original relay and it still doesn't work. The
washer does still work.

    I wondered if the relay from the 100 has gone wrong in some bizarre way
that causes it to wreck something else in the
    system, - it certainly seems to have stopped the coupe's wiper.

    Any thoughts ? (By the way I have checked the fuses)

    Cheers


        rob Hod