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 windscreen wiper delay ECU.
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 washer. 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 fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Current passes across fusible link 5 (C0570-2) which is connected to the ignition switch (C0028-1) by a brown/white wire.
With the ignition switch in position ’II’, current flows across the switch (C0094-1) to fuses 2 and 3 of the passenger compartment fuse box (C0580-1) on a white wire. Fuse 3 (C0580-6) supplies power to the rear wash/wipe circuit, while fuse 2 (C0580-4) supplies power to the front wash/wipe circuit.
Front Wipers and Washers
Fuse 2 of the passenger compartment fuse box (C0580-4) supplies a feed to the windscreen wiper delay ECU (C0303-8) on a white/green wire.
Slow and Fast Speeds
Fuse 2 also provides a feed to the wash/wipe switch (C0278-6) on a white/green wire. Moving the switch to the slow speed position allows power to flow across the switch (C0278-1) to the wiper motor (C0030-3) on a blue/light green wire. This feed into the wiper motor also has to pass through an internal resistor. This extra resistance causes the motor to operate at slow speed. The wiper motor is earthed (C0030-1) on a black wire.
Moving the wiper switch to the fast speed position allows power to flow through the switch (C0278-5) to the wiper motor (C0030-5) on a red/light green wire. This time the feed from the switch flows direct to the wiper motor, causing it to operate at fast speed. Again, the motor is earthed (C0030-1) on a black wire.
Operating the flick wipe function outputs a feed from the wash/wipe switch (C0278-1) to the wiper motor (C0030-3) on the red/light green wire for as long as the switch is held against spring pressure. The wipers operate at slow speed.
Park Circuit
Positioning the wash/wipe switch back to the ’Off’ position cuts power to the wiper motor on the blue/light green or red/light green wire (depending on the operational speed of the wiper motor). The park circuit operates to return the wipers to their park position. The park switch (C0030-4) is integral to the wiper motor, and receives a feed on a white/green wire from fuse 2 of the passenger compartment fuse box (C0580-4). 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 (C0030-2) to the windscreen wiper delay ECU (C0303-5) on a brown/light green wire. The windscreen wiper delay ECU (C0303-2) is connected to the wash/wipe switch (C0278-4) by a yellow/light green wire. Power flows through the wash/wipe switch (C0278-1) to the wiper motor (C0030-3) on a blue/light green wire. The wiper motor (C0030-1) is earthed on a black wire. The wipers operate until their park position is reached. The park switch then opens, cutting the power supply to the wiper motor.
Intermittent Wipe
Moving the wash/wipe switch to the intermittent wipe position allows power to flow across the switch (C0278-3) to the windscreen wiper delay ECU (C0303-1) on a white/green wire. When this signal is received by the ECU, it switches the path to earth (C0303-4) on and off approximately every 5 seconds on a black wire. An intermittent feed is then supplied from the ECU (C0303-2) to the wash/wipe switch (C0278-4) on a yellow/light green wire. Power flows through the switch (C0278-1) and supplies the wiper motor (C0030-3) on a blue/light green wire. The wipers operate at slow speed.
Programmed Wash Wipe
Depressing the end of the wash/wipe switch operates the programmed wash/wipe function. When the switch is closed, power flows across the switch (C0278-2) to the windscreen wiper delay ECU (C0303-6) and the windscreen washer pump (C0008-2). Both are supplied a feed on light green/black wires. The washer pump (C0008-1) is earthed on a black wire.
When the windscreen wiper delay ECU (C0303-6) receives a feed from the wash/wipe switch (C0278-2), it supplies a feed (C0303-2) back to the wash/wipe switch (C0278-4) on a yellow/light green wire. Power flows across the wash/wipe switch (C0278-1) and onto the wiper motor (C0030-3), which operates at slow speed. When the washer switch is released, the ECU will operate the wipers for a further 3 cycles. Once this has been completed, the feed to the wash/wipe switch is cut by the ECU and the park circuit is initiated.
Rear Wiper
The rear wiper switch (C1197-1) is supplied a feed by fuse 3 of the passenger compartment fuse box (C0580-6) on a white/green wire. When the switch is in the ’On’ position (C1194-1), power is fed to the rear screen wiper motor (C0388-2) on a red/light green wire. The wiper motor (C0388-1) is earthed on a black wire.
Rear Park Circuit
Positioning the rear wiper switch to the ’Off’ position cuts power to the rear wiper motor on the red/light green wire. The park circuit operates to return the wiper to its park position. The park switch (C1105-2) is integral with the wiper motor. It receives a feed from fuse 3 (C0580-6) of the passenger compartment fuse box on a white/green then 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 switch (C1105-1) to the rear wiper switch (C1195-1) on a brown/light green wire. Power flows across the wiper switch (C1194-1) back to the wiper motor (C0388-2) on a red/light green wire. The wiper motor (C0388-1) is earthed on a black wire. The wiper operates until the park position is reached, when the park switch opens, cutting the power supply to the motor.
Rear Wash
The rear washer switch (C1197-1) is supplied a feed by fuse 3 of the passenger compartment fuse box (C0580-6) on a white/green wire. When the switch is depressed, power is supplied (C1196-1) to the rear screen washer pump (C0021-2) on a black/light green wire. The washer pump (C0021-1) is earthed on a black wire.