The mode control actuator mounted on heater unit adjusts position of mode door by operating Direction Motor based on signal of A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent? B/L ? floor ? mix.
DTC B1249 sets if the Mode Actuator Sensor signal is at or below 0.1V for 0.3 seconds.
Item
Detecting Condition
DTC Strategy
Voltage check
Poor Connection in harness
Open in signal (Feedback signal), Power or Gruoud circuit
Faulty Mode Actuator
Faulty Air conditioner Control Unit
Enable Conditions
Ignition ON
Threshold value
Mode Actuator Sensor signal is at or below 0.1V for 0.3 seconds
Failsafe
If the Mode actuator is placed at Vent mode right before fail detection, Actuator is operated and fixed to Vent Mode Postion.
The others mode are selected, Actuator is moved to DEF mode 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