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 (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.