2401135 - E3020 WINDSCREEN WASH/WIPE - Functional description

Functional description

The electronic device inside the steering column switch unit H5 and the controls on the right lever are supplied at pin 11 of connector A by the line 'controlled by the ignition' (INT/A) of relay T12 protected by fuse F43, both housed in the underdashboard control unit B2. Pin 7 of connector A and pin 9 of connector C of H5 are earthed.

Depending on the pre-selected function, the stalk unit H5 (connector A) sends control signals to the windscreen wiper motor N15:

  • from pin 8 for fast operation;
  • from pin 9 for the slow and/or intermittent operation,
  • pin 6, on the other hand, receives the earth signal coming from the motor end of travel cam which stops operation. The windscreen wiper motor N15 is then connected to earth.
When operated, the windscreen washer switch on the steering column switch unit H5 sends two signals from pins 10 and 12 of connector A which operate the windscreen washer pump N22 which sends the detergent liquid to the front. Rain sensor K125 is supplied by the INT line protected by fuse F49 of control unit B2, and sends an automatic operation signal to pin 2 of connector A of H5 - via A-BUS serial line of Body Computer M1 - pin 7 of connector D and pin 25 of connector B. The Body Computer M1 is connected, via the CAN line, to the instrument panel E50 to manage the 'failure' warning light if there are problems with the rain sensor.