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 .
The Air conditioner Control Module sets DTC B2406 if Driver air mix actuator has not been moved to the mode,where air condition control module controls, within 40 seconds.
Item
Detecting Condition
DTC Strategy
Voltage check
Poor contact in harness
Open or short in motor power circuit
Faulty Driver air mix actuator
Faulty air conditioner control module
Enable Conditions
IG KEY ON
Threshold value
No movement to controlled mode position for 40 seconds
Failsafe
Fixed as current position
? 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