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DTC 18

id070200803100

DTC 18 | Air mix actuator (potentiometer) (present)
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POSSIBLE CAUSE | • Air mix actuator malfunction • Climate control unit malfunction • Open circuit between air mix actuator and climate control unit • Short circuit between air mix actuator (terminal C) and climate control unit (terminal 1U: 24-pin)

Diagnostic Procedure

STEP | INSPECTION | ACTION
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1 | • Inspect air mix actuator. • Is it okay? | Yes | Go to the next step.
No | Replace air mix actuator.
2 | • Disconnect airflow mode actuator connector. • Is resistance between terminals 1U and 1I of climate control unit connector (24-pin) more than 387 ohms? | Yes | Go to the next step.
No | Repair wiring harness. (Short circuit)
3 | • Disconnect climate control unit connector (24-pin). • Is resistance between terminals 1B and 1I of climate control unit connector (24-pin) less than 4.8 kilohms? | Yes | Go to the next step.
No | Repair wiring harness. (Open circuit)
4 | • Is resistance between terminals 1B and 1U of climate control unit connector (24-pin) less than 4.2 kilohms? | Yes | Replace climate control unit.
No | Repair wiring harness. (Open circuit)