The mode control actuator mounted on heater unit adjusts position of mode door by generating 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 B2409 if the direction motor dosen’t move to intended position within 40sec (In this case, ECM try to move mode door for 2sec. 3 times, every 20 sec. before setting DTC)
Item | Detecting Condition | Possible Cause |
Monitor Strategy Description | ● Voltage check | ● Poor connection of connected part ● Open circuit in harness ● Short circuit in harness ● Faulty DR Direction potentiometer ● Fault A/C Control Unit |
Threshold value | ●< 0.1V | |
Detecting time | ● 0.3sec | |
FAIL SAFE |
