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 B1250 sets if Mode Actuator sensor signal is at or over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Short in signal circuit(Feedback signal) 2. Faulty Mode Actuator 3. Faulty Air conditioner Control Module |
Enable Conditions |
•
Ignition ON | |
Threshold value |
•
Mode Actuator sensor signal is at or over 4.9V 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.
•
In case of the others, Actuator is moved to DEF mode position |
※ Voltage value of potentiometer as a function of mode door position.
Mode Door Position | Voltage |
VENT | 0.3±0.15V |
BI-LEVEL | 1.4±0.4V |
FLOOR | 2.5±0.4V |
MIX | 3.6±0.4V |
DEF | 4.7±0.15V |
