The Air Mix actuator contains a motor that changes temp door position and a potentiometer that monitors position of temp door. The Air mix actuator(Temperature actuator) regulates the temperature by operating temp door motor. The potentiometer delivers temp door position to the A/C ECU .
DTC B1246 sets if Driver Air mix actuator(Temperature actuator) sensor signal is at or over 4.9V for 0.3 seconds.
Item
Detecting Condition
DTC Strategy
Voltage check
Short to battery in signal circuit(Feedback signal)
Faulty Driver temperature Actuator
Air conditioner Control Module
Enable Conditions
Ignition ON
Threshold value
Driver Air mix actuator(Temperature actuator) sensor signal is at or over 4.9V for 0.3 seconds.
Failsafe
If the Driver set temperature is below 24?(76.1?) right before fail detection, Actuator is operated and fixed to Cool Postion.
Actuator is operated and fixed to Warm Position if set temperature is over 25?(77?)
? Voltage value of 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