The front wipers are controlled via the wash/wipe switch mounted on the steering column. The front wipers have two speed settings, a flick wipe facility, and an intermittent wipe function, which is controlled by a wiper delay ECU. The wiper delay ECU also controls the programmed wash wipe function, which is activated by pressing the end of the wash/wipe switch.
The rear screen wiper is controlled via a latching switch mounted on the fascia centre module. The rear screen wash facility is controlled via a separate non-latching switch, which is also located on the fascia centre module.
Operation
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 5 (C0570) is connected to the ignition switch (C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 9 and fuse 10 of the passenger compartment fuse box (C0580) on a W wire.
Fuse 9 (C0580) supplies power to the front wash wipe circuit on a WG wire. Fuse 10 (C0580) supplies power to the rear wash wipe circuit on a WG wire.
Front Wipers
Fuse 9 of the passenger compartment fuse box (C0580) provides an ignition feed to the following on WG wires:
- The wash/wipe switch (C1740 on LHD, C0278 on RHD)
- The wiper delay ECU (C2009 on LHD, C0303 on RHD)
- The wiper motor park switch (C1593 on LHD, C0030 on RHD).
Slow Wipe
When the wash/wipe switch is moved to the slow wipe position, current flows from the switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a ULG wire. Current flows across the motor (C1593 on LHD, C0030 on RHD) to earth on a B wire. As current has to flow through the in-line resistor located within the wiper motor, the wiper motor operates at slow speed.
Fast Wipe
When the wash/wipe switch is moved to the fast wipe position, current flows across the switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a RLG wire. Current flows across the motor (C1593 on LHD, C0030 on RHD) to earth on a B wire. Current by-passes the in-line resistor located within the wiper motor, enabling the motor to operate at fast speed.
Intermittent Wipe
When the wash/wipe switch is moved to the intermittent wipe position, current flows across the switch (C1740 on LHD, C0278 on RHD) to the wiper delay ECU (C2009 on LHD, C0303 on RHD) on a WG wire. The wiper delay ECU (C2009 on LHD, C0303 on RHD) returns a pulsed voltage signal back to the wash wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire. The pulsed voltage signal flows through the wash wipe switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a ULG wire. The wiper motor operates at slow speed during the intermittent wipe function.
Flick Wipe
When the wash/wipe switch is moved upwards against (but not past) spring pressure, the wipers will operate until the switch is released. Current flows across the wash/wipe switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on an RLG wire, powering the motor at fast speed until the wash/wipe switch is released.
Park Circuit
The park circuit allows the wipers to return to their park position when the wash/wipe switch has been moved back to the off position. The park switch is integral with the wiper motor (C1593 on LHD, C0030 on RHD), and receives an ignition feed from fuse 9 of the passenger compartment fuse box (C0580) on a WG wire.
The park switch is open circuit when the wipers are in any position other than their park position. When the wipers reach their park position, the switch contacts close, enabling the ignition feed from fuse 9 of the passenger compartment fuse box to flow to the wiper delay ECU (C2009 on LHD, C0303 on RHD) on an NLG wire. The wiper delay ECU (C2009 on LHD, C0303 on RHD) then provides a feed to the wash/wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire. The wipers continue to operate at slow speed (as described in the Slow Wipe section previously) until they reach their park position. The park switch then returns to its open position, cutting the feed to the wiper delay ECU.
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 (C2009 on LHD, C0303 on RHD) on an LGB wire. The wiper delay ECU (C2009 on LHD, C0303 on RHD) 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.