Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Outline
Current is applied at all times to TERMINAL 5 of the FAN NO. 1 relay through the RDI FAN fuse.
When the ignition SW is turned on, current flows through the ECU-IG fuse to the FAN NO. 1 relay (Coil side) to TERMINAL CF of the engine control module. At the same time, current from the ECU-IG fuse flows to the FAN NO. 2 relay (Coil side) to TERMINAL 3 of the pressure SW.
- Low Speed Operation
When the A/C system is operating, the FAN NO. 1 relay is turned on. As a result, current flows from the RDI FAN fuse to FA NO. 1 relay (Point side) to TERMINAL 2 of the radiator fan motor and out TERMINAL 1 to TERMINAL 3 of the FAN NO. 2 relay then out TERMINAL 4 to TERMINAL 2 of the radiator fan resistor and finally out TERMINAL 1 to GROUND, and the radiator fan motor rotates at low speed.
- High Speed Operation
When the pressure SW comes on or the engine control module is activated, the FAN NO. 1 and NO. 2 relays are turned on. As a result, current flows from the RDI FAN fuse to the FAN NO. 1 relay (Point side) to the radiator fan motor to TERMINAL 3 to the FAN NO. 2 relay and out TERMINAL 5 to GROUND, and the radiator fan motor rotates at high speed.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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