General description

GENERAL DESCRIPTION

With the lever on the righthand side of the steering wheel it is possible to engage the different functions of the windscreen washer/wiper, rearscreen washer/wiper and headlamp washer system.

The windscreen wiper device can work continuously and intermittently at different speeds: moving the lever upwards and holding it in this position will select continuous operation (75 passes per min.) which is turned off when the lever is released; if the lever is pushed downwards firstly intermittent operation is engaged and then continuous operation: these functions stay on until the lever is moved upwards again.

With the lever in the rest position, through the special ring switch it is possible to select the different lengths of the intermittent functions (appr. 45, 25 and 11 passes per min.).

From Model Year '97 the device is changed to obtain a second continuous speed of 61 strokes/min and two intermittent speeds (27 and 11 strokes/min). The rearscreen wiper function (intermittent at 15 strokes) is turned on turning the special ring.

The windscreen washer is engaged slightly pulling the lever towards the steering wheel; the rearscreen washer by pushing it towards the dashboard: this way the windscreen/rearscreen washer pump is operated for appr. 4 seconds or until the lever is released.

When the side lights are on, the same windscreen washer controls also operate the headlamp washer: this is an electropneumatic device in which a pump sends the detergent fluid to a double nozzle that sprays a powerful jet onto the headlamp.

A timer operates the headlamp washer pump with successive impulses which last for about half a second.

NOTE: Operating the windscreen/rearscreen washer (and headlamp washer) without detergent fluid in the reservoir can damage the pump.

The entire system is regulated by a windscreen wiper intermittency device located in the fusebox, which controls the windscreen and rearscreen wiper motors, the windscreen and rearscreen washer pump and the headlamp washer device (timer and pump).

The windscreen wiper and washer and rearscreen wiper/washer can be operated with the ignition key engaged and, as mentioned previously, the headlamp washer can only work with the side lights on (chassis no.__ the dipped beam lights).

FUNCTIONAL DESCRIPTION

Windscreen wiper

The windscreen wiper intermittence device N14, located in fusebox G1, is supplied via the key-operated relay I35 (pin +) and fuse F3 also in G1.

When the windscreen wiper switch of the lever unit B68 is operated, it sends two different signals depending on the function selected; from pin 3 for continuous speed and from pin 6 for intermittent operation.

The signal from pin 3 (continuous speed) passes directly to the wiper motor P1 as a command signal: motor P1 is connected to earth and supplied with the same line as the intermittent device N14. It comprises the the actual gear motor, stroke limit contacts (for automatic parking of the blades) and the supply relay switch.

The signal from pin 6 (intermittent speed) of B68 reaches the intermittent device N14 (pin INT) from where it is then sent to the motor P1 (pin COM).

Turning the switch (ring) of the lever unit B68 either no, or one (R1), or two (R2) resistances are connected on the same line, thereby obtaining three intermittent speeds.

Rear screen wiper

Operating the rearscreen wiper ring switch the signal is sent from pin 7 of B68 to N14 (pin IL). The intermittent device sends a command (from pin CL to the rearscreen wiper motor P21 which is supplied from the ignition switch key-operated supply through fuse F4 of G1 ("A" and "B") or from fuse F3 of G1 "C".

This motor comprises the gear motor, stroke limit contacts and the supply relay switch.

Windscreen/rearscreen washer

When operated, the windscreen washer (and headlamp washer) switch of the lever unit B68 sends two signals from pin 2 and from pin 5 which reach the intermittent device N14 (pin PL and P) for operating the windscreen washer for 4 sec., and they operate the windscreen washer pump P19; a command signal is also sent to the headlamp washer timer N12.

Pump P19 is two-way: it sends water to the spray jets of the windscreen washer or rearscreen washer depending on the terminal supplied with 12V while the other is connected to earth.

Headlight washer

The timer N12, located on the bracket outside the fusebox G1, is supplied directly by the battery through fuse G312 (20A).

When the consensus signal resulting from the side lights being on reaches the relay in addition to the lever unit switch command, the relay switch inside N12 is energized which supplies the headlamp washer pump P20 for about half a second.

From chassis no.__ the enable signal is received by the turning on of the dipped beams.