Dtc B1449/49 Rear Air Outlet Damper Control Servo Motor Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING INTELLIGENT TESTER (REAR MODE DAMPER SERVO)

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

CHECK REAR MODE DAMPER SERVO SUB-ASSEMBLY

CHECK AIR CONDITIONING HARNESS ASSEMBLY

DTC B1449/49 Rear Air Outlet Damper Control Servo Motor Circuit


DESCRIPTION

The rear mode damper servo sub-assembly sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the rear air outlet damper to any position, which controls the air outlet modes.
The air conditioning amplifier assembly communicates with the servo through the No. 2 air conditioning harness.
HINT:
Confirm that there are no mechanical problems because this DTC may be stored when either a damper link or damper is mechanically locked.

DTC Code
DTC Detection Condition
Trouble Area
B1449/49
Rear air outlet damper position does not change when the air conditioning amplifier assembly operates the rear mode damper servo sub-assembly.
  1. Rear mode damper servo sub-assembly
  2. No. 2 air conditioning harness assembly
  3. Harness or connector
  4. 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 B1449/49 Rear Air Outlet Damper Control Servo Motor Circuit


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    Result
    Result
    		Proceed to
    DTC B1449/49 is not output
    		A
    DTC B1449/49 is output
    		B
    DTC B1449/49 and B1497/97 are output
    		C


B
Go to step 2

C
GO TO B1497/97 (LandCruiser RM000002LLQ052X.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

2.READ VALUE USING INTELLIGENT TESTER (REAR MODE DAMPER SERVO)

  1. Use the Data List to check if the rear mode damper servo sub-assembly is functioning properly (LandCruiser RM000002LIV040X.html).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Outlet Servo Pulse (R)
    		Rear mode damper servo sub-assembly target pulse / Min.: 0, Max.: 255
    		83 (pulse): FACE
    41 (pulse): B/L
    7 (pulse): FOOT
    		-
    Air Mix Servo Actual Pulse (R)
    		Rear mode damper servo sub-assembly actual pulse / Min.: 0, Max.: 255
    		83 (pulse): FACE
    41 (pulse): B/L
    7 (pulse): FOOT
    		-
    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 RM0000045E302NX.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 RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    OK:
    DTC B1449 is not output.


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

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

  1. Disconnect the Q13 harness connector.

  1. Disconnect the G24 amplifier connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Q13-3 (RBUS) - G24-1 (RBUS)
    		Always
    		Below 1 Ω
    Q13-4 (RBBU) - G24-23 (RBBU)
    		Always
    		Below 1 Ω
    Q13-2 (RBUG) - G24-21 (RBUG)
    		Always
    		Below 1 Ω
    G24-1 (RBUS) - Body ground
    		Always
    		10 kΩ or higher
    G24-23 (RBBU) - Body ground
    		Always
    		10 kΩ or higher
    G24-21 (RBUG) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK REAR MODE DAMPER SERVO SUB-ASSEMBLY

  1. Replace the rear mode damper servo sub-assembly (LandCruiser RM000001JR303LX.html).

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

  1. Clear the DTCs (LandCruiser RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    OK:
    DTC B1449 is not output.


NG
Go to step 6
OK

END (REAR MODE DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

6.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 RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    OK:
    DTC B1449 is not output.


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

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)