The front windscreen wipers are controlled from the column switch and operate when the ignition switch is in position "II". The wipers have 2 speed settings, along with a flick wipe and single wipe facility. An intermittent wipe function and programmed wash wipe facility is controlled by the front wiper delay unit.
Moving the wiper switch down from the off position initiates the intermittent wipe function. Moving the wiper switch up one position from the off position, operates the wipers at slow speed. Moving the wiper switch up two positions from the off position, operates the wipers at fast speed. Pushing the wiper switch up from the off position, not allowing it to latch, and then releasing it causes the wipers to perform a single wipe cycle at slow speed. Pushing and holding the wiper switch up from the off position, not allowing it to latch, causes the wipers to operate at slow speed until the wiper switch is released.
Pressing the end of the wiper switch, initiates the programmed wash wipe sequence. The windscreen washers operate while the switch is pressed and the wipers continue to operate for a number of cycles after the switch is released.
The rear screen wiper and wash facilities are controlled by a switch mounted on the dash panel. Pressing the switch causes the rear washer to operate until the switch is released. The rear wiper does not operate automatically with the rear wiper. Turning the switch clockwise causes the rear wiper to operate until the switch is turned back to the off position.
Operation
Feed from the positive battery terminal is connected to the engine compartment fuse box (C632-1) by a brown wire. Current passes through fusible link 2 (C907-2) which is connected to the ignition switch (C028-1) by a brown wire. With the ignition switch in position "II", power flows across the switch (C094-1) to fuse 3 (C580-5) and fuse 4 (C580-7) of the passenger compartment fuse box, which are connected in parallel. Both are fed by white wires. Fuse 3 supplies the rear wash/wiper circuit, and fuse 4 the front wash/wipe circuit.
Front Wipers and Washers
Fuse 4 of the passenger compartment fuse box (C580-8) supplies the front wiper delay unit (C303-8) a 12 volt feed on a green wire when the ignition switch is in position "II".
Slow and Fast Speeds
Fuse 4 also provides a feed to the wash/wipe switch (C278-6) on a green wire. Moving the switch to the slow speed position allows power to flow across the switch (C278-1), to the wiper motor (C030-3) on a blue/light green wire. This feed into the wiper motor does not energize all the motor windings, therefore the motor operates at slow speed. The wiper motor is earthed (C030-1) on a black wire. Moving the wiper switch to the fast position allows power to flow through the switch (C278-5) to the wiper motor (C030-5) on a red/light green wire. This time, all motor windings are energized and the motor operates at fast speed. Again, the wiper motor (C030-1) is earthed on a black wire.
Operating the flick wipe function outputs a feed from the wash/wipe switch (C278-5), and onto the wiper motor (C030-5) for as long as the switch is held against spring pressure. The wipers operate at fast speed.
Park Circuit
Positioning the wash/wipe switch to the "off" position cuts power to the wiper motor on the blue/light green or red/light green wire. The park circuit operates to return the wipers to their park position. The park switch (C030-4), integral to the wiper motor unit, receives a 12 volt supply from fuse 4 of the passenger compartment fuse box (C580-6) on a green wire. The park switch is closed with the wipers in any position other than their park position.
With the park switch closed, power flows across the switch (C030-2) to the front wiper delay unit (C303-5) on a brown/light green wire. The front wiper delay unit (C303-2) is connected to the wash/wipe switch (C278-4) by a yellow/light green wire. Power flows through the wash/wipe switch (C278-1) to the wiper motor (C030-3) on a blue/light green wire. The wiper motor is earthed on a black wire. The wipers operate until their park position is reached and the park switch opens, cutting power supply to the wiper motor.
Intermittent Wiper Function
Moving the wiper switch to the intermittent wipe position allows power to flow across the switch (C278-3) to the front wiper delay unit (C303-1) on a white/green wire. With a 12 volt signal applied to the delay unit from the wiper switch, the delay unit switches the route to earth (C303-4) on and off approximately every 5 seconds on a black wire.
Programmed Wash/Wipe Function
Depressing the end of the wiper switch operates the programmed wash/wipe function. The washer switch (C278-6) is supplied from fuse 4 of the passenger compartment fuse box (C580-8) on a green wire. When the switch is closed, power flows through the switch (C278-2) to the front wiper delay unit (C303-6) on a green/black wire, and to the windscreen washer pump (C008-2) on another green/black wire. The washer pump is earthed (C008-1) on a black wire.
When the delay unit (C303-6) receives a feed from the washer switch (C278-2), it outputs a feed (C303-2) to the wash/wipe switch (C278-4) on a yellow/light green wire. Power flows out through the wash/wipe switch (C278-1) and onto the wiper motor (C030-3), which operates at slow speed. When the washer switch is released, the delay unit will operate the wipers for a further 3 cycles.
Once this has been completed, feed to the wash/wipe switch is cut by the delay unit and the park circuit is initiated.
Rear Wiper
The rear wiper switch (C918-1) is supplied by fuse 3 of the passenger compartment fuse box on a green wire. When the switch is in the "on" position (C915-1), power is fed to the rear screen wiper motor (C388-2) on a red/light green wire. The wiper motor (C388-1) is earthed on a black wire.
Park Circuit
Positioning the wiper switch to the "off" position cuts power to the wiper motor on the red/light green wire. The park circuit operates to return the wiper to its park position. The park switch (C079-2), integral to the wiper motor unit, receives a 12 volt supply from fuse 3 of the passenger compartment fuse box (C580-6) on a green wire. The park switch is closed with the wiper in any position except its park position
With the park switch closed, power flows across the park switch (C079-1) to the wiper switch (C916-1) on a brown/light green wire. Power flows through the wiper switch (C915-1) to the wiper motor (C388-2) on a red/light green wire. The wiper motor is earthed (C388-1) on a black wire.
Rear Wash
The rear wash switch (C918-1) is supplied by fuse 3 of the passenger compartment fuse box on a green wire. When the switch is closed (C917-1), power is fed to the rear screen washer pump (C021-2) on a black/light green wire. The washer pump (C021-1) is earthed on a black wire. The rear screen wash does not operate the rear wiper.