FAN CONTROL MODULE CONSTRUCTION/OPERATION [LF, L5]
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Construction
• Fan control module is installed on the radiator cowling.
Operation
• The fan control module allows continuously variable control of the cooling fan motor rotation rate, reducing fan operation noise and power consumption.
• Based on the input signals from the control parts, the cooling fan may remain operational for several seconds or minutes after the ignition is switched off. (See
ELECTRICAL FAN CONTROL OUTLINE [LF, L5].)
Fail-safe function
The fan control module has a power supply function to operate the cooling fan motor and the following protection functions.
1. Over-current fail-safe
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― If current to the cooling fan motor exceeds the specified value, the fan control module stops the cooling fan motor for a specified period of time.
2. Over heat fail-safe
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― If the internal area of the fan control module exceeds the specified temperature, the fan control module stops the cooling fan motor for a specified period of time.
3. Input signal open circuit fail-safe
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― If there is an open circuit in the wiring harness between the PCM and the fan control module, the fan control module stops the cooling fan motor.
4. Reversed polarity fail-safe
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― If there is a reversed power connection, the fan control module incorporates protection against reversed polarity. The motor reacts to reversed connections with unregulated, high-speed rotation in the opposite direction.
