Programmed Wash Wipe

Programmed Wash Wipe

Pressing the end of the wash/wipe switch initiates the programmed wash/wipe function. When the switch is pressed, current flows across the switch (C1740 on LHD, C0278 on RHD) to the windscreen washer pump (C0008) on an LGB wire. The pump (C0008) is earthed on a B wire.

When the switch is pressed, the wash/wipe switch (C1740 on LHD, C0278 on RHD) also provides a feed to the wiper delay ECU (C0303) on an LGB wire. The wiper delay ECU (C0303) will now provide a feed to the wash/wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire, which operates the wipers at slow speed (as described in the Slow Wipe section previously). When the washer switch is released, the wiper delay ECU will operate the wipers for a further three cycles.

Rear Wiper

Fuse 10 of the passenger compartment fuse box (C0580) provides a feed to the following on WG wires:

The rear screen wiper motor park switch (C1105) The rear screen wiper relay (C0124) The rear washer switch (C0073).

The earth path for the rear screen wiper relay coil (C0124) is controlled by the rear screen wiper switch (C0079) on a BG wire. When the switch is pressed, current flows across the closed switch contacts to earth on a B wire. The energised rear screen wiper relay (C0124) provides a feed to the wiper motor (C0388) on an RLG wire. Current flows through the wiper motor (C0388) to earth on a B wire.

Park Circuit

The park circuit allows the rear screen wiper to return to its park position when the wiper switch has been switched off. The park switch is integral with the wiper motor (C1105), and receives an ignition feed from fuse 10 of the passenger compartment fuse box (C0580) on a WG wire.

The park switch is open circuit when the wiper is in any position other than its park position. When the wiper reaches its park position, the switch contacts close, enabling the ignition feed from fuse 10 of the passenger compartment fuse box to flow to the wiper relay (C0124) on an NLG wire. The de-energised relay (C0124) provides a feed to the wiper motor (C0388) on an RLG wire. The wiper continues to operate until it reaches its park position. The park switch then returns to its open position, cutting the feed to the wiper relay.