Dtc B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING INTELLIGENT TESTER (AIR MIX DAMPER SERVO)

CHECK FOR DTC

CHECK DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)

CHECK AIR CONDITIONING HARNESS ASSEMBLY

DTC B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)


DESCRIPTION

The damper servo sub-assembly (air mix damper servo) 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 mix damper to any position. As a result, the air mix damper varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air is as requested.
HINT:
Confirm that no mechanical problem is present because this trouble code may be stored when either a damper link or damper is mechanically locked.

DTC Code
DTC Detection Condition
Trouble Area
B1441
The air mix damper position does not change when the air conditioning amplifier assembly operates the damper servo sub-assembly (air mix damper servo).
  1. Damper servo sub-assembly (air mix damper servo)
  2. Air conditioning harness assembly
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000002LIT04AX.html).

  1. Check for DTCs (LandCruiser RM000002LIT04AX.html).

    Result
    Result
    		Proceed to
    DTC B1441 is not output
    		A
    DTC B1441 is output
    		B
    DTC B1441 and B1497 are output
    		C


B
Go to step 2

C
GO TO B1497 (LandCruiser RM000002LLQ053X.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

2.READ VALUE USING INTELLIGENT TESTER (AIR MIX DAMPER SERVO)

  1. Use the Data List to check if the damper servo sub-assembly (air mix damper servo) is functioning properly (LandCruiser RM000002LIV041X.html).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Mix Servo Targ Pulse (D)
    		Damper servo sub-assembly (air mix damper servo) target pulse / Min.: 0, Max.: 255
    		112 or 127 (pulse): MAX COOL
    21 or 31 (pulse): MAX HOT
    		-
    Air Mix Servo Actual Pulse (D)
    		Damper servo sub-assembly (air mix damper servo) actual pulse / Min.: 0, Max.: 255
    		112 or 127 (pulse): MAX COOL
    21 or 31 (pulse): MAX HOT
    		-
    OK:
    The display is as specified in the normal condition column.
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to the DTC)
    		A
    OK (When troubleshooting according to Problem Symptoms Table)
    		B
    Both target pulse and actual pulse do not display
    		C
    Target pulse displays normally, but actual pulse does not display
    		D


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000045EC00TX.html)

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)

D
Go to step 4
A


3.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000002LIT04AX.html).

  1. Check for DTCs (LandCruiser RM000002LIT04AX.html).

    OK:
    DTC B1441 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.CHECK DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)

  1. Replace the damper servo sub-assembly (air mix damper servo) (LandCruiser RM000003AXS04FX.html).

    HINT:
    Since the damper servo sub-assembly (air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the damper servo sub-assembly (air mix damper servo) with a new or normally functioning one.

  1. Clear the DTCs (LandCruiser RM000002LIT04AX.html).

  1. Check for DTCs (LandCruiser RM000002LIT04AX.html).

    OK:
    DTC B1441 is not output.


NG
Go to step 5
OK

END (DAMPER SERVO SUB-ASSEMBLY [AIR MIX DAMPER SERVO] IS FAULTY)

5.CHECK AIR CONDITIONING HARNESS ASSEMBLY

  1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one (LandCruiser RM000003AXS04FX.html).

  1. Clear the DTCs (LandCruiser RM000002LIT04AX.html).

  1. Check for DTCs (LandCruiser RM000002LIT04AX.html).

    OK:
    DTC B1441 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)
OK

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)