The heater operates when the ignition switch is turned to position I or II. The blower motor is controlled via a three position rotary switch, which is located on the driver side of the fascia. Two slider controls are also located on the fascia centre module, controlling heater temperature and direction.
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) provides a constant battery feed to the ignition switch (C1043 on LHD, C0038 on RHD) on an NW wire. When the ignition switch is turned to position I, current flows across the switch (C1730 on LHD, C0099 on RHD) to fuse 16 of the passenger compartment fuse box (C0580) on a WO wire.
Blower Motor
Fuse 16 of the passenger compartment fuse box (C0580) provides a feed to the blower motor (C0023 on RHD, C0056 on RHD) on a PG wire. The earth path for the motor is controlled by the rotary heater switch.
Switch Position 0
With the rotary switch in the off position, current cannot flow across the motor windings.
Switch Position 1
With the rotary switch in position I, current flows across the motor (C0023 on LHD, C0056 on RHD) to the switch (C1508 on LHD, C0058 on RHD) on a GY wire. The switch (C1508 on LHD, C0058 on RHD) is earthed on a B wire. As current also has to flow through the in– line resistor located in the motor, the motor operates at slow speed.
Switch Position 2
With the rotary switch in position II, current flows across the motor (C0023 on LHD, C0056 on RHD) to the switch (C1508 on LHD, C0058 on RHD) on a GS wire. The switch (C1508 on LHD, C0058 on RHD) is earthed on a B wire. As current by–passes the in–line resistor located in the motor, the motor operates at high speed.