2429886 - 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 function selected, steering column switch unit H5 N15

  • from pin 8 for fast operation
  • from pin 9 for slow and/or intermittent operation (for the intermittent operation the signal reaches the intermittent device and from there is sent to the control device and then to the motor)
  • pin 6, on the other hand, receives the earth signal coming from the motor end of travel cam which stops operation.
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 directly operate the windscreen washer pump N22 . 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.