Lexus IS250 IS220d GSE20 ALE20 - AIR CONDITIONING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

REPLACE AIR OUTLET CONTROL SERVO MOTOR

DTC B1443/43 Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The mode damper servo 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 mode damper to any position, which controls the air outlet switching.


  • 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
B1443/43 Air outlet damper position sensor value does not change even if air conditioner amplifier operates air outlet control servo motor
Air outlet control servo motor
Air conditioning harness
A/C amplifier

WIRING DIAGRAM

Dtc B1443/43 Air Outlet 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 MODE 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 Outlet Servo Pulse (D)
(Air Out Pulse-D)		Driver side air outlet servo motor target pulse / Min.: 0, Max.: 255FACE: 9 to 17 (pulse)
B/L: 32 to 38 (pulse)
FOOT: 56 to 70 (pulse)
FOOT/DEF: 84 (pulse)
DEF: 97 (pulse)		-
  • 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 OUTLET 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 B1443/43 is outputA
    DTC B1443/43 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