Park Circuit

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 (C30-4) is integral to the wiper motor. It receives a feed from fuse 18 of the passenger compartment fuse box (C581-16) 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 (C30-2) to the front wiper relay (C39-5) on a brown/light green wire. The front wiper relay (C39-2) 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 (C30-3) on a blue/light green wire. The wiper motor is earthed (C30-1) on a black wire. The wipers operate until their park position is reached and the park switch 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 (C278-3) to the front wiper relay (C39-1) on a white/green wire. When this signal is received by the relay, it switches the route to earth (C39-4) on and off approximately every 5 seconds on a black wire. An intermittent feed is then supplied from the relay (C39-2) to the wash/wipe switch (C278-4) on a yellow/light green wire. Power flows through the switch (C278-1) and supplies the wiper motor (C30-3) 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. The washer switch (C278-6) is supplied a feed by fuse 18 of the passenger compartment fuse box (C581-16) on a green wire. When the switch is closed, power flows across the switch (C278-2) to the front wiper relay (C39-6) and the windscreen washer pump (C8-2). Both are supplied a feed on light green/black wires. The washer pump is earthed (C8-1) on a black wire.