E3021 Rear window wash/wipe

Description

The rearscreen wiper is operated by turning the ring nut on the end of the lever located on the right of the steering wheel.

The operation of the rearscreen wiper motor is controlled intermittently by the electronic device inside the steering column switch unit which also manages the windscreen wash/wipe: the activation of the rearscreen wiper is synchronized with the windscreen wiper, but the frequency is half that of the windscreen wiper

By pushing the lever gently towards the steering wheel the rearscreen washer function is activated; the same (two-way) pump is used as for the windscreen washer, but it rotates in the opposite direction and sends the detergent fluid to the rear, following the same control logic: the rearscreen wiper is activated the, as the rearscreen washer command is over, an additional stroke is carried out.

When the windscreen wiper is working, engaging reverse gear automatically activates the rearscreen wiper: this function is managed by the Body Computer which forwards this information, coming from the reversing lights function control logic, to the electronic device in the steering column switch unit Wiring diagram E2022 REVERSE LIGHT .

The rearscreen wash/wipe can only be operated with the ignition switched ON.

The rearscreen wash/wipe circuit is protected by a specific fuse (which also protects the windscreen wash/wipe circuit) and operated by the ignition-operated relay, located in the junction unit.

The windscreen wash/wipe circuit is protected by a specific fuse and is operated by the ignition-operated relay located in the underdashboard control unit.

The windscreen wiper and washer can be operated with the ignition key turned to MAR.(INT/A).

Description of operation

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 the relay T12 protected by the fuse F43, both housed in the underdashboard control unit B2.

The electronic section of the steering column switch unit H5 which manages the rearscreen wiper function is supplied at pin 2 of connector C from the same line 'controlled by the ignition' (INT/A) for the relay T12 protected by the fuse F52, housed in the underdashboard control unit B2.

When the rearscreen wiper function is switched on, the steering column switch unit H5 sends the control signal to the rearscreen wiper motor N16 from pin 3 of connector C; pin 4, on the other hand, receives the earth signal coming from the motor end of travel cam which stops the operation. The motor N16 is then earthed.

The windscreen/rearscreen washer switch, when operated, sends two signals from pins 10 and 12 of connector A which operate the windscreen/rearscreen washer pump N22 directly.

Pin 3 of connector A receives the automatic rearscreen wiper activation signal coming from the Body Computer M1, pin 1 of connector A Wiring diagram E2022 REVERSE LIGHT .

Wiring diagram

Components

Component location