DTC 18

id070200803100

DTC 18

Driver-side front air mix actuator (potentiometer) (present) (L.H.D.)

Passenger-side front air mix actuator (potentiometer) (present) (R.H.D.)

POSSIBLE CAUSE

•  Driver-side (passenger-side) front air mix actuator malfunction

•  Open circuit between driver-side (passenger-side) front air mix actuator and front climate control unit

•  Short circuit between driver-side (passenger-side) front air mix actuator and front climate control unit

DTC 18	Driver-side front air mix actuator (potentiometer) (present) (L.H.D.) Passenger-side front air mix actuator (potentiometer) (present) (R.H.D.)
POSSIBLE CAUSE	• Driver-side (passenger-side) front air mix actuator malfunction • Open circuit between driver-side (passenger-side) front air mix actuator and front climate control unit • Short circuit between driver-side (passenger-side) front air mix actuator and front climate control unit

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Inspect driver-side (passenger-side) front air mix actuator. (See FRONT AIR MIX ACTUATOR INSPECTION.) • Is it okay?	Yes	Go to the next step.
1		No	Replace driver-side (passenger-side) front air mix actuator. (See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
2	• Disconnect passenger side (driver side) front air mix actuator connector. • Disconnect front airflow mode 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 following terminals of front climate control unit connector (16-pin) more than 840 ohms? ― 2P and 2F (driver-side) (L.H.D.) ― 2P and 2G (passenger-side) (R.H.D.)	Yes	Go to the next step.
2		No	Repair wiring harness. (Short circuit)
3	• Disconnect front climate control unit connector (16-pin). • Is resistance between terminals 2P and 2B of front climate control unit connector (16-pin) less than 7.8 kilohms?	Yes	Go to the next step.
3		No	Repair wiring harness. (Open circuit)
4	• Is resistance between following terminals of front climate control unit connector (24-pin) less than 6.24 kilohms? ― 2B and 2F (driver-side) (L.H.D.) ― 2B and 2G (passenger-side) (R.H.D.)	Yes	Inspect the connection of the front climate control unit connector.
4		No	Repair wiring harness. (Open circuit)