Condenser Fan: Description and Operation

FAN MOTOR OPERATION
With the ignition SW turned ON, the current through ECU-IG fuse flows to the Fan NO. 1 relay (Coil side), or the Fan NO. 2 relay (Coil side) and Fan NO. 3 relay (Coil side). Furthermore, the current through the Fan NO. 1 relay (Coil side) or the Fan NO. 2 relay (Coil side) flows to TERMINAL 3 of the A/C single pressure SW to TERMINAL 2 to TERMINAL 2 of the water temp. SW No.1 to TERMINAL 1 to GROUND, causing the Fan NO. 1 relay to turn OFF and the Fan NO. 2 Relay to turn ON.

1. LOW SPEED OPERATION
Only when the A/C system is activated or the water temp. SW No. 2 is turned ON, the A/C condenser fan motor and the radiator fan motor rotates at low speed.
When the A/C system is activated, the current from ECU-IG fuse flows to the Fan NO. 3 relay (Coil side) to TERMINAL 1 of the diode (A/C) to TERMINAL 2 to TERMINAL 12 of the A/C amplifier (Manual A/C), TERMINAL 2 of the A/C control assembly (Automatic A/C), causing the Fan NO. 3 relay to turn ON. As a result, the current through the CDS fuse flows to TERMINAL 2 of the A/C condenser fan motor to TERMINAL 1 to TERMINAL 3 of the Fan NO. 2 relay to TERMINAL 5 to TERMINAL 5 of the Fan NO. 3 relay to TERMINAL 3 to TERMINAL 2 of the radiator fan motor to TERMINAL 1 to GROUND. As this flowing in series for the motors, the motors rotate at low speed.
When the water temp. SW No. 2 is turned ON, the current from ECU-IG fuse flows to the Fan NO. 3 relay (coil side) to TERMINAL 1 of the water temp. SW No. 2 to GROUND, causing the Fan NO. 3 relay to turn ON. As a result, the current through the CDS fuse flows the same route as above, rotating the motors at low speed.

2. HIGH SPEED OPERATION
Only when the A/C single pressure SW is turned OFF or the water temp. SW No. 1 is turned OFF, the A/C condenser fan motor and the radiator fan motor rotates at high speed.
When the A/C single pressure SW is turned OFF, the current from the RDI fuse flows to the Fan NO. 1 Relay (Point side) to TERMINAL 2 the radiator fan motor to TERMINAL 1 to GROUND. At the same time, the current from CDS fuse flows to TERMINAL 2 of the A/C condenser fan motor to TERMINAL 1 to TERMINAL 3 of the Fan NO. 2 Relay to TERMINAL 4 to GROUND.
As the current flowing in parallel for the motors as above, the motors rotate at high speed.