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Front Wiper Faults

Front Wiper Faults Brand: Renault Models: Laguna 3

Symptom
Customer complaint is that wipers are inoperative, intermittent wipers are inoperative or wipers park half-way up the windscreen.

Repairs

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
LAGUNA >> LAGUNA 3 >> UNDER BONNET SWITCHING UNIT >> ACTIVATIONS.
 
Checking low speed wiring
  • 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.
Checking PARK position
  • 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.