The Temperature Control Actuator(Air mix potentiometer) is located at heater unit. It contains temp motor that changes temp door position and potentiometer that monitors position of temp door.The Temperature Control Actuator regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temp door by operating temp motor and then temperature will be regulated by the hot/cold air ratio decided by position of temp door. In operation, potentiometer delivers temp door position transformed into voltage value to A/C ECU.
DTC B1204 sets if the Passenger Air mix actuator(Temperature actuator) Sensor signal is at or below 0.1V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Open in signal circuit (Feedback circuit), Power circuit or Ground Circuit. 2. Faulty passenger temperature control actuator. 3. Faulty A/C control unit. |
Enable Conditions |
•
Ignition ON | |
Threshold value |
•
Passenger Air mix actuator(Temperature actuator) Sensor signal is at or below 0.1V for 0.3 seconds | |
Failsafe |
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setting temperature : 16℃(62.6℉)-24℃(76.1℉) fix at max. cooling position
•
setting temperature : 25℃(77℉)-31℃(89.6℉) fix at max. heating position |
※ Voltage value of temperature control actuator(Air mix potentiometer) as a function of temp door position.
Door position | Voltage |
Max. cool | 0.3±0.15V |
Max. warm | 4.7±0.15V |
