Condenser Fan: Description and Operation

With the ignition SW turned ON, the current through the ECU-IG fuse flows to the fan No. 1 relay (Coil side), 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. 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 (for fan No. 3 relay) to TERMINAL 2 to TERMINAL (A) 3 (automatic A/C) or (B) 12 (manual A/C) of the A/C amplifier, 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 3 of the fan No. 3 relay to TERMINAL 5 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 rotate 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 of the radiator fan motor to TERMINAL 1 to GROUND. At the same time, the current from 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 4 to GROUND.
As the current flowing in parallel for the motors as above, the motors rotate at high speed.