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.
The ECM sets DTC B1249 if there is an open circuit or poor connection in the DR Direction actuator signal harness.
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 actuator |
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 Direction potentiometer as a function of position of mode switch.
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 |
