Radiator Cooling Fan: Description and Operation

System Outline

The current is applied at all times through the RDI fuse to TERMINAL 3 of the FAN N0.1 relay. When the ignition SW is turned on, the current flows through the ECU-IG fuse to FAN N0.1 relay (Coil side) to TERMINAL 6 of the engine control module. At the same time as this current flow, the current from ECU-IG fuse flows to the FAN N0.2 relay (Coil side) to TERMINAL 3 of the pressure SW (Single) and TERMINAL 7 of the engine control module.

1. Low Speed Operation
When the A/C system is operating, the FAN N0.1 Relay is turned on. As a result, the current flows from the RDI fuse to FAN N0.1 relay (Point side) to TERMINAL 2 of the radiator fan motor to TERMINAL 1 to TERMINAL 3 of the FAN N0.2 relay to TERMINAL 4 to TERMINAL 2 of the A/C condenser fan resistor to TERMINAL 1 to GROUND, and the radiator fan motor rotates at low speed.

2. High Speed Operation
When the pressure SW (Single) is on or engine control module operated, the FAN N0.1 and N0.2 relay is turned on. As a result, the current flows from the RDI fuse to FAN N0.1 relay (Point side) to radiator fan motor to TERMINAL 3 of the FAN N0.2 Relay to TERMINAL 5 to GROUND, and the radiator fan motor rotates at high speed.