The mode control actuator adjusts position of mode door.
It is mounted on heater unit and has three independent actuator in it, Vent actuator, DEF actuator, Floor actuator.
Each actuator is consist of two parts, Direction motor that adjusts position of mode door and potentiometer that detects position of mode door.
when driver press mode switch, A/C control unit translates it into voltage form signal and sends it to mode actuator. Direction motor is operated by this signal(voltage form signal from A/C control unit) to adjust mode door position and The mode control actuator send position information detected by potentiometer back to A/C control unit to verify adjusting mode door .
The ECM sets DTC B2418 if the direction motor dosen't move to intended position within 40sec(The ECM attempts to move the temp door for a 2 second duration at a frequency of 3 times every 20 seconds before storing a DTC.)
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage check
?Poor connection of connected part
? Open circuit in power harness
? Short circuit in harness
? Faulty DR Direction actuator(FLOOR)
? Fault A/C Control Unit
Threshold value
? 0.5V<Potentiometer voltage <4.5V
Detecting time
? 40 sec
FAIL SAFE
? Setting mode : OPEN Fix at OPEN position
? Setting mode : Except OPEN Fix at CLOSE position
? Voltage value of Direction potentiometer as a function of position of mode switch(FLOOR)
Door position
Voltage
Error Detecting Condition
OPEN
0.3±0.15V
Undervoltage : 0.08V or less
CLOSE
4.7±0.15V
Overvoltage : 4.9V or more