939003617 - J020 REARSCREEN AND DOOR MIRROR DEFROSTING NOT WORKING

With the ignition ON, when the button in the control panel for the climate control is pressed, the heated rear windscreen and the rear view mirrors do not heat up properly
If the battery voltage is below 11.6 V, the heated rear windscreen and rear view mirrors are not supplied by the control unit.
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Check that neither the defrosting of the rearscreen or the rear view mirrors is working.Move on to Step 11. Only the rearscreen is not working.1. Proceed as instructed in the,    See table J021 HEATED REAR WINDSCREEN NOT WORKING
2. Just the rear view mirrors are not working.2. Proceed as instructed in the,    See table J022 DOOR MIRROR DEFROSTING NOT WORKING
1DEFROSTING FUNCTION ON LED CHECKALL OKPROBLEMS ENCOUNTEREDACTION
When the button in the climate control system panel is pressed, check whether the LED in the actual button comes on to signal that the function is working.Move on to Step 2Defrosting LED fails to come on.Restore the connection between the climate control system control unit and services control unit    See E3020 WINDSCREEN WASH/WIPE Move on to Step 3
2DEFROSTING ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the following, in order:

  • Heated rear windscreen fuse;
  • Heated rear windscreen relay;
  • Connection between heated rear windscreen relay and services control unit;
  • Services control unit power supply
    See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
Move on to Step 31. Connections not correct.1. Restore the correct connections.
2. Component defective.2. Replace the component involved (in the case of a fuse, find out what caused it to blow).
3SERVICES CONTROL UNIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the services control unit is working properly: in particular, the control function for the rear windscreen and rear view mirrors defrosting    Op. 5505 INSTRUMENT/GAUGE ELECTRICAL CIRCUITS End of diagnosisServices control unit not working.Replace the services control unitOp. 5505A18 MULTI-FUNCTION CONTROL UNIT - R R