The Air mix actuator(Temperature actuator) located at heater unit. It contains temp motor that changes temp door position and potentiometer that monitors position of temp door. The Air mix actuator(Temperature 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.
Airconditioner Control Module sets DTC B1204 if the Feed Back signal of Passenger Air mix actuator(Temperature actuator) has been detected open or below 0.1V for 0.1 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Poor connection of connected part 2. Open in signal circuit (Feedback circuit), Power circuit or Ground Circuit 3. Faulty passenger air mix actuator 4. Faulty A/C control unit |
Enable Conditions |
•
IG KEY ON | |
Threshold value |
•
Feedback signal has been detected open or below 0.1V for 0.1 seconds. | |
Failsafe |
•
setting temperature : 24.5℃(76.1℉) fix at max. cooling position
•
setting temperature : 25℃(77℉) fix at max. heating position |
Door position | Voltage |
Max. cool | 0.4 V |
Max. warm | 4.6 V |
