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 Air conditioner Control Module sets DTC B2409 if Driver Direction 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 Direction actuator
Faulty air conditioner control module
Enable Conditions
Ignition ON
Threshold value
No movement to controlled mode position for 40 seconds
Failsafe
Fixed as current position
? Voltage value of potentiometer as a function of mode door position.
Mode Door Position
Voltage
VENT
0.3V
VENT/DEF
1.77V
VENT/FLOOR
1.03V
VENT/DEF/FLOOR
2.5V
FLOOR
3.23V
DEF/FLOOR
3.97V
DEF
4.7V