The 2001 Lexus GS430 controls the fan speed in 3 steps (OFF, Low, High) by using the water temperature switch in accordance with the engine coolant temperature and the operating condition of the air conditioner and by turning the 3 fan relays ON and OFF and connecting 2 fan motors in a series or parallel circuit. Below schematic illustrates the 2001 Lexus GS430 System Wiring Diagram.

Lexus GS430 Cooling Fan System Wiring Diagram 

Index of Lexus GS430 System Wiring Diagram:

1. Battery
2. Ignition Switch
3. Fan Main Relay
4.
5. Fan No.1 Relay
6. Fan No.2 Relay
7. Fan No.3 Relay
8. To A/C Magnetic Clutch Relay
9. A/C Pressure switch
10. Water Temperature Switch
11. Radiator Fan Motor

Source: http://www.lextreme.com/forums/3uzfe.pdf



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