The Intake door is located at the heater unit and controls the source of air entering the HVAC system (Fresh or Recirculation). The door is controlled via a motor that changes the intake door position. The actuator includes a potentiometer that monitors position of intake door. When driver operates the intake switch, the HVAC ECU receives a signal and then commands the door motor to turn intake door to the intended position.
The Airconditioner Control Module sets DTC B1209 if the Feed Back signal of Intake Actuator has been detected over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Short to battery in signal(Feedback) circuit 2. Open in ground circuit 3. Faulty Intake Actuator 4. Faulty Air Conditioner Module |
Enable Conditions |
•
IG KEY ON | |
Threshold value |
•
Feedback circuit has been detected over 4.9V for 0.3 seconds. | |
Failsafe |
•
Intake Actuator is moved and fixed at FRE position if FRE is selected or REC position if REC is selected. |
※ Voltage value of Intake potentiometer as a function of position of Intake door
Door position | Voltage |
FRE | 0.3±0.15V |
REC | 4.65±0.15V |
