DTC 21

id070200803300

DTC 21 | Front airflow mode actuator (potentiometer) (present)
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POSSIBLE CAUSE | • Front airflow mode actuator malfunction • Open circuit between front airflow mode actuator and front climate control unit • Short circuit between front airflow mode actuator (terminal E) and front climate control unit (terminal 2E: 16-pin)

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | • Inspect front airflow mode actuator. (See FRONT AIRFLOW MODE ACTUATOR INSPECTION.) • Is it okay? | Yes | Go to the next step.
No | Replace front airflow mode actuator. (See FRONT AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION.)
2 | • Disconnect driver side and passenger side front air mix actuator connector. • Disconnect rear air mix actuator connector. • Disconnect rear airflow mode actuator connector. • Disconnect ambient temperature sensor connector. • Disconnect cabin temperature sensor connector. • Disconnect front and rear evaporator temperature sensor connector. • Is resistance between terminals 2E and 2P of front climate control unit connector (16-pin) more than 840 ohms? | Yes | Go to the next step.
No | Repair wiring harness. (Short circuit)
3 | • Disconnect front climate control unit connector (16-pin). • Is resistance between terminals 2B and 2P of front climate control unit connector (16-pin) less than 7.8 kilohms? | Yes | Go to the next step.
No | Repair wiring harness. (Open circuit)
4 | • Is resistance between terminals 2B and 2E of front climate control unit connector (16-pin) less than 6.24 kilohms? | Yes | Inspect the connection of the front climate control unit connector.
No | Repair wiring harness. (Open circuit)