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With the engine and blower motor being operated, if the PTC heater does not operate by
setting the heater control temperature to highest position at the coolant temperature of 77 °C
or lower, the PTC heater, PTC heater relay, heater controller assembly (A/C-ECU) or its circuit
system may be faulty.
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- Malfunction of the PTC heater
- Malfunction of the PTC heater relay 1
- Malfunction of the PTC heater relay 2
- Malfunction of the PTC heater relay 3
- Damaged the wiring harness or connectors
- Malfunction of the heater controller assembly (A/C-ECU)
- Malfunction of the engine-ECU
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1.Check the wiring harness between the heater controller assembly (A/C-ECU) connector
terminal 9 and engine-ECU.
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2.Check the trouble symptom procedures of engine-ECU (Refer to GROUP 13C - Inspection
Procedure 27: PTC heater relay system )
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