Technical Uno Mk2 windscreen wiper - only high speed working

[eby]

Uno Mk2 Diesel. The windscreen wiper slow and intermittent speed are not working at all, only the high speed (position 3) is working. And when switching to position 2 or 1 from highspeed, the wiper stops at its position. However when switching to position 0 (off), it returns to its resting position.

How to diagnose this, Is there a relay for wiper motor ?.

Thanks,

 

[olliefromuk]

I have the exact same issue, hoping someone else has an answer too

 

[eby]

Answering my own query.

There is a relay directly attached to the wiper motor, replacing this resolved my issue.

FIAT part number - 9942950 / 9942949 DEVICE FOR INTERMITTENT OPERATION(both have slightly different pin angles, check your wiper motor compatibility).

Circuito Motor Do Limpador De Parabrisa Do Fiat Elba - R$ 252,44

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DEVICE INTERMITTENT WIPER ORIGINAL FIAT 9942950 LANCIA Y10 ONE

DEVICE INTERMITTENT WIPER ORIGINAL FIAT 9942950 LANCIA Y10 ONE

www.autoricambilineaverde.it

Diagnostics steps.
1, Using automotive test light, check connectivity on steering column wiper switch and wiring. If everything in order proceed further.
2, Remove wiper arm.
3, Carefully remove Cowl Top(watch out for water jet hose).
4, Remove water tank.
5, Remove wiper motor(do not remove the connectors yet).
6, Using automotive test light(this time using + side directly on battery), check the speed control part of the relay(4 wire white connector). If the motor do not respond to slow / intermittent speed when circuit is closed, replace the relay.

Hope this helps others having similar issue.