B1442

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1442/42: Air Inlet Damper Control Servo Motor Circuit

DTC B1442/42 - Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The REC/FRS damper servo motor sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air inlet damper to any position, which controls the intake air settings (fresh, fresh/recirculation and recirculation).
HINT: Confirm that no mechanical problem is present because this trouble code can be stored when either a damper link or damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (REC/FRS DAMPER SERVO MOTOR)
(a) Use the Data List to check if the servo motor is functioning properly.

Air Conditioner





OK:
The display is as specified in the normal condition.
NG -- REPLACE REC/FRS DAMPER SERVO MOTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
2. REPLACE REC/FRS DAMPER SERVO MOTOR
(a) Replace the REC/FRS damper servo motor Disassembly.
HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

NEXT -- Continue to next step.
3. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1442 is not output.
NG -- REPLACE AIR CONDITIONING HARNESS ASSEMBLY
OK -- REPLACE REC/FRS DAMPER SERVO MOTOR