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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Cooling Fan System (HEV) - Diagnostics & Circuit Tests) >> COOLING FAN SYSTEM (for HEV Model) >> Cooling Fan Circuit [12/2022 - ] >> Description

Cooling Fan Circuit [12/2022 - ]: Description

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The ECM turns on or off the fan relays using signals calculated from the engine coolant temperature, air conditioning switch (on/off), air conditioning refrigerant pressure, engine speed and vehicle speed signals.

The ECM switches the circuit of the cooling fan motors between series and parallel by turning on or off the fan relays in order to control the speed of the cooling fan motors in two steps.

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