Park Circuit

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.