The mode control actuator mounted on heater unit adjusts position of mode door by operating Direction Motor in accordance with signal of A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent→ B/L → floor → mix.
The ECM sets DTC B2419 if the direction(DEF) 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 harness ● Short circuit in harness ● Faulty DR Direction(DEF) actuator ● Fault A/C Control Unit |
Threshold value | ● < 0.1V | |
Detecting time | ● 0.3sec | |
FAIL SAFE | ● Setting mode : VENT Fix at VENT position ● Setting mode : Except VENT Fix at DEF position |
※ Voltage value of Air Mix potentiometer as a function of temp door position.
Door position | Voltage | Error Detecting Condition |
VENT | 0.3±0.15V | Undervoltage : 0.10V or less |
DEF | 4.7±0.15V | Overvoltage : 4.92V or more |
