Celica GT Convertible L4-2164cc 2.2L DOHC MFI (1997)
When the Ignition SW is turned ON. current from the ECU-IG fuse flows to the Fan No.1 Relay (Coil Side) and the Fan No.2 Relay (Coil Side)
--> TERMINAL 3 of the A/C single pressure SW --> TERMINAL 2 --> TERMINAL 2 (5S-FE), 1 (7A-FE) of the water temp. SW (Radiator
Fan) --> TERMINAL 1 (5S-FE) --> GROUND, and the Fan No.1 Relay and the Fan No.2 Relay are turned ON.
At the same time that this current flows, current from the ECU-IG fuse flows to the E/G Main Relay (Coil Side) to GROUND, causing the E/G
Main Relay to turn ON. As a result. current from the ALT fuse flows to the CDS fuse and RDI fuse.
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Low Speed Operation
When the Ignition SW is turned ON and the A/C is activated, current flows from the A/C comp relay (Point Side) to the Fan No.3 Relay (Coil
Side) --> GROUND, causing the Fan No.3 Relay to turn ON. As a result, current from the CDS fuse flows to TERMINAL 2 of the A/C
condenser Fan Motor --> TERMINAL 1 --> the Fan No.2 Relay (Point Side) --> the Fan No.3 Relay (Point Side) --> TERMINAL 2 of the
Radiator Fan Motor --> TERMINAL 1 --> GROUND, and each of the Fan Motor, with the result that the Fans are activated at low speed.
If the Engine Coolant Temperature is Approx. 90° C (194° F) or less, and the refrigerant pressure is Approx. 15.5 kg/cm2 (220 psi, 1520 kPa)
or less, both the water temp. SW (For Radiator Fan) and the A/C dual pressure SW are closed, so that the Fan No.1 Relay and the fan No.2
Relay are turned ON. As a result, each of the Fan Motor Operate at low speed.
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High Speed Operation
When, during A/C operation, the refrigerant pressure becomes higher than ordinary level (Approx. 15.5 kg/cm2 (220 psi. 1520 kPa)), the A/C
single pressure SW is turned OFF. As a result, the Fan No.1 Relay and the Fan No.2 Relay are turned OFF, and current flows from the RDI
fuse to Fan No.1 Relay (Point Side) --> TERMINAL 2 of the Radiator Fan Motor --> TERMINAL 1 --> GROUND, and current from the
CDS fuse flows to TERMINAL 2 of the A/C condenser Fan Motor --> TERMINAL 1 --> the Fan No.2 Relay (Point Side) --> GROUND,
and to each of the Fan Motor in Parallel, thus causing the Fan Motor to operate at high speed.
Note that, because current flows in the same manner even if the Engine water temperature is Approx. 90°C (194° F) or higher, the Fan Motor
still operates at high speed.
