3239315 - E3020 WINDSCREEN WASH/WIPE - Functional description
Functional description
The windscreen wiper control on the steering column switch unit H5 selects the various operating modes of the windscreen wash/wipe. The stalk unit H5 is supplied at pin 3 of connector D from the ignition-operated line (INT/A) of the relay R1 protected by the fuse F14: both are contained in the junction unit B1 .Depending on the pre-selected function, the stalk unit H5 (connector A) sends the following control signals to the internal electronic device to the windscreen wiper motor N15:
- from pin 2 for continuous fast operation: the signal reaches the motor directly;
- from pins 3, 4 for continuous slow and medium-fast oeration: the signal arrives from the intermittent device and is then sent to the motor
- from pin 5 for intermittent operation: the signal reaches the intermittent device and is then sent to the motor; this signal differs according to adjustment ring position, which adds no resistance, one resistance or two resistances to the line to obain the three different intermittence speeds.