Lexus IS250 IS220d GSE20 ALE20 - AIR CONDITIONING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

REPLACE AIR INLET CONTROL SERVO MOTOR

DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The damper servo (air inlet control) sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner 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).


  • HINT:
  • Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.
DTC No.DTC Detection ConditionTrouble Area
B1442/42 Air inlet damper position sensor value does not change even if air conditioner amplifier operates air inlet control servo motor
Air inlet control servo motor
Air conditioning harness
A/C amplifier

WIRING DIAGRAM

Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit. AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the intelligent tester main switch on.

Operate the R/F (Recirculation/Fresh) switch.

Select the item below in the Data List, and read the display on the intelligent tester.

Data List / Air Conditioner:
ItemMeasurement Item / Display (Range)Normal ConditionDiagnostic Note
Air Inlet Damper Targ Pulse
(A/I Damp Targ Pls)		Air inlet damper target pulse / Min.: 0, Max.: 255LHD:
RECIRCULATION: 31 (pulse)
FRESH: 7 (pulse)
RHD:
RECIRCULATION: 7
FRESH: 27		-
  • OK:
  • The display is as specified in the normal condition column.
  • Result:
  • ResultProceed to
    NGA
    OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)B
    OK (When troubleshooting according to the DTC)C
B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C
REPLACE AIR CONDITIONING AMPLIFIER
A
2.REPLACE AIR INLET CONTROL SERVO MOTOR
  • HINT:
  • Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal.

Check for DTCs.

  • Result:
  • ResultProceed to
    DTC B1442/42 is outputA
    DTC B1442/42 is not outputB
B
END
A
REPLACE AIR CONDITIONING HARNESS
LEXUS IS250, IS220d / GSE20 ALE20
AIR CONDITIONING
Lexus IS250 IS220d GSE20 ALE20
AIR CONDITIONING SYSTEM