DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit: 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 damper servo (air inlet control) 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 inlet mode selection air inlet control damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION, and RECIRCULATION).
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 |
|---|---|---|
| B1442/42 | Air inlet damper position sensor value does not change even if A/C amplifier operates air inlet control servo motor |
|