Blower Motor

Fuse 15 (C0580) provides an ignition feed to the following on WG wires:

The blower motor relay (C0153) The air conditioning unit (C1273) The blower motor switch (C1508) The air conditioning temperature control switch (C0275).

Fuse 12 (C0580) provides an ignition feed to the Engine Control Module (ECM) (C0658) on a WG wire.

Blower Motor

The blower motor relay coil (C0153) receives an ignition feed from fuse 15 of the passenger compartment fuse box (C0580) on a WG wire. The relay coil (C0153) is earthed on a UB then B wire. The energised blower motor relay (C0153) provides a feed to the blower motor (C0023) on a UW wire.

Blower Speed 1 When the rotary blower switch is in position 1, current flows across the motor windings (C0023) to the blower motor resistor (C0425) on a U wire. The blower motor resistor (C0425) is connected to the blower motor switch (C1508) by a G wire. As current has to flow through a high resistance rating within the blower motor resistor, the blower motor operates at slow speed. The blower motor switch (C1508) is earthed on a UB then B wire.

Blower Speed 2 When the rotary blower switch is in position 2, current flows across the motor windings (C0023) to the blower motor resistor (C0425) on a U wire. The blower motor resistor (C0425) is connected to the blower motor switch (C1508) by an NY wire. As current has to flow through a lower resistance rating within the blower motor resistor, the blower motor operates at increased speed. The blower motor switch (C1508) is earthed on a UB then B wire.

Blower Speed 3 When the rotary blower switch is in position 3, current flows across the motor windings (C0023) directly to the blower motor switch (C1508) on a U wire. As the blower motor resistor is by-passed, the blower motor operates at fast speed. The blower motor switch (C1508) is earthed on a UB then B wire.

Engine Control Module

The air conditioning unit (C1273) monitors blower motor operation on a U wire. When the motor is operational, the air conditioning unit (C1273) provides a feed to the Engine Control Module (ECM) (C0658) on a WB then PB wire.