Toyota Prius 2010 Repair Manual page 183

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PTC Heater Circuit

The PTC heater assembly is installed in the radiator in the heater unit and operates when engine coolant

temperature is low and normal heater effectiveness is insufficient.

The A/C control assembly switches the circuit in the PTC relay and operates the PTC heater assembly when the

operating conditions (cooling water temperature is below 65°C (149°F), setting temperature is MAX. HOT,

ambient temperature is below 10°C (50°F) and blower switch is not OFF) are met.

The PTC heater assembly controls PTC heater lines by electric load or the amount of inverter with converter

assembly (PCU) output. Therefore, troubleshooting should be performed with other electric components off.

WIRING DIAGRAM

INSPECTION PROCEDURE

2010 Toyota Prius

Repair Manual