Customer complaint is that wipers are inoperative, intermittent wipers are inoperative or wipers park half-way up the windscreen.
Connect the AssistPlus and scan under the bonnet switching unit and UCH. If there are any DTCs relating to the front wipers, proceed as below.
- Check all fuses for connections and water ingress to the under-bonnet switching unit, wiper motor and wiper stalk.
- Operate the wiper stalk and in UCH >> STATUSES, check WIPER STALK POSITION and ensure it matches the different speeds of the wiper stalk:
LAGUNA >> LAGUNA 3 >> UCH >> STATUSES
- In the under-bonnet switching unit, check in statuses WINDSCREEN WIPER PARKED POSITION and ensure it conforms:
- Missing = Not Parked
- Parked = Parked
- Check fuses and check for water ingress in the under-bonnet fuse switching unit. Also check connection to wiper motor. The under-bonnet switching unit is located in the engine bay on the n/s inner wing.
- Carry out a continuity/load test on the wiring as below:
- Note: Use AssistPlus to activate the wiper low and high speeds by going into under-bonnet switching unit activations
- With ignition ON and low speed wiper position activated in under-bonnet switching unit, check supply between pins 2 and 5 of the wiper motor.
- With ignition ON and low speed wiper position activated in under-bonnet switching unit, check earth between pin 1 and a good chassis earth.
- With ignition OFF, check continuity of signal wire between pin 1 of wiper motor and pin 4 brown connector CN on the under-bonnet fuse box.
- With ignition OFF, check continuity between pin 4 of the wiper motor and pin 10 grey connector CT1 on the under-bonnet fuse box.
- With ignition ON, check insulation from earth and from 12 volts on pin 4 of the wiper motor.
- Parked position can be seen in the under-bonnet switching statuses.
Pin-outs for wiper motor
Pin 1 = wiper high speed control
Pin 2 = wiper low speed control
Pin 4 = wiper park position control
Pin 5 = earth
Depending on the results of these tests, consider replacement of the affected component or repair the wiring.
If you are considering replacing the under-bonnet switching unit, call the Renault Team.