Wiper and Washer Systems: Description and Operation

All functions are initiated by means of a multi-function switch which is operated by the wiper lever on the right of the steering column.

The wiper and washer circuits are protected by fuse F20 located in the central electrical box.

Front Wiper
The front wiper consists of:
^ Two wiper arms
^ Wiper motor
^ Wiper arm linkage
^ Two wiper blades
^ Wiper relay, located in the central electrical box
^ Central Timer Module (CTM), in the CJB
^ Multi-function switch, incorporating
- Wiper switch
- Washer switch (push switch) and
- Delay control rotary switch (depending on model)







Wiper Functions - Windshield
The wiper motor has two speeds and a limit switch for the park position. It is controlled by the multi-function switch on the steering column through the wiper relay and the CTM.

After switching on the ignition (position II) the following five wiper functions are available:
^ Off
^ Wipe once
^ Slow
^ Fast
^ Intermittent

Wiper Lever In The OFF Position
If the wiper lever is switched from another position to OFF, the wiper motor continues to operate at a slow speed until the park position is reached and then stops. Using a second circuit and a limit switch, power is supplied to the wiper motor after it is switched off until the limit switch cuts off the flow of current through the wiper relay (normally closed contact) and the multifunction switch to the wiper motor.

Wiper Lever In The ONCE Position
Push the wiper lever downwards and release allowing it to return automatically to the OFF position. The wiper performs one wipe cycle at a slow speed. The current flows through the multi-function switch to the wiper motor.

Wiper Lever In The SLOW Position
Push the wiper lever two steps upwards. The wiper operates at a slow speed. The current flows through the multi-function switch to the wiper motor.

Wiper Lever In The FAST Position
Push the wiper lever three steps upwards. The wiper operates at fast speed. The current flows through the multi-function switch to the wiper motor.







Wiper Lever In The INTERMITTENT Position
Push the wiper lever one step upwards. The wiper performs single wiping movements at a slow speed with pauses between them. Depending on the model, the wiping interval is either at the fixed 9 second interval or one of six steps can be selected by turning the selector at the end of the wiper lever (Position 1 = short interval. Position 6 = long interval).

The multi-function switch transmits a 12 V signal through the normally closed contact of the washer switch to the CTM which periodically activates the wiper relay at intervals of nine seconds or as set by the selected wiping time interval (depending on the model). The current flows through the wiper relay (normally open contact) and the multi-function switch to the wiper motor.

Windshield Washer

WARNING: Washer fluid contains the poisonous substance methanol. Observe the safety rules. Failure to follow these instructions will result in personal injury.

CAUTION: Operate the washer for a maximum of 10 seconds. Do not operate with an empty washer reservoir.

The windshield washer consists of:
^ Washer reservoir, underneath the right-hand front fender
^ Washer pump, on the outside of the washer reservoir
^ Two adjustable washer nozzles on the hood. There are two possible functions, dependent on the wiper operation:

Wiper Lever In The OFF or INTERMITTENT Position
The wiper and the washer pump operate for as long as the wiper lever is pulled towards the steering wheel. Releasing the wiper lever causes the washer pump to be switched off immediately. The wipers perform two to three more cycles before they adopt the intermittent operation again (in the INTERMITTENT position) or stop in the park position (in the OFF position).

Wiper Lever In The SLOW or FAST Position
The washer operates together with the wipers for as long as the wiper lever is pulled towards the steering wheel. The current flows from the multi-function switch through the washer pump to the CTM and the washer switch. The washer switch in the active state makes the ground connection.