DTC B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side): Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
The air mix damper servo sends pulse signals to inform the A/C amplifier of the damper position The A/C amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (driver seat) to any position As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver seat side is controlled The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness
HINT.
Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or the damper is mechanically locked.
DTC DETECTION CONDITION AND TROUBLE AREA
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1446/46 | Air mix damper position sensor value does not change even if A/C amplifier operates air mix control servo motor |
|