The actuator contains a motor that changes intake door position and a potentiometer that monitors position of the door. When the driver changes the air intake switch, the ECU operates intake door motor to turn the intake door to the intended position. (in the FRESH mode, the intake door is closed. In REC mode, the intake door is opened) During operation the potentiometer delivers an intake door position to the A/C ECU.
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
DTC Strategy
Voltage check
Short to battery in signal(Feedback) circuit
Open in ground circuit
Faulty Intake Actuator
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