2892519 - E3020 WINDSCREEN WASH/WIPE - Functional description

Functional description

The windscreen wiper stalk of the stalk unit H5selects 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. The supply for the relay R1 comes from the direct line of the maxifuse J/B1 of B5, whilst the coil is supplied by the line (INT/A) protected by the fuse B26.

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 operation: the signal arrives from the intermittent device and is then sent to the motor

The windscreen wiper motor N15 is then connected to earth. It consists of the actual geared motor, the end of travel contacts and the electronic adjustment and control device. When operated, the windscreen washer switch on the steering column switch unit H5, sends two signals from pin 8 and pin 9 of connector A, which reach the pump for operating the windscreen washer N22 directly (the operation of this pump N22 in the opposite direction operates the "rearscreen washer" function: See E3021 REAR WINDOW WASH/WIPE ).