Dtc B1447 Air Mix Damper Control Servo Motor Circuit (Rear)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING INTELLIGENT TESTER (REAR AIR MIX DAMPER SERVO)

CHECK FOR DTC

CHECK REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY

CHECK AIR CONDITIONING HARNESS ASSEMBLY

DTC B1447 Air Mix Damper Control Servo Motor Circuit (Rear)


DESCRIPTION

The rear air mix damper servo sub-assembly sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear air mix damper to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted and the temperature of the air blowing toward the rear is controlled.
The air conditioning amplifier communicates with the servo through the No. 2 air conditioning harness assembly.
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
B1447
Rear air mix damper position does not change when the air conditioning amplifier operates the rear air mix damper servo sub-assembly.
  1. Rear air mix damper servo sub-assembly
  2. No. 2 air conditioning harness assembly
  3. Harness or connector
  4. Air conditioning amplifier

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 B1447 Air Mix Damper Control Servo Motor Circuit (Rear)


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 B1447 is not output
    		A
    DTC B1447 is output
    		B
    DTC B1447 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 (REAR AIR MIX DAMPER SERVO)

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

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Mix Servo Targ Pulse (R)
    		Rear air mix damper servo sub-assembly target pulse / Min.: 0, Max.: 255
    		9 (pulse): MAX COOL
    54 (pulse): MAX HOT
    		-
    Air Mix Servo Actual Pulse (R)
    		Rear air mix damper servo sub-assembly actual pulse / Min.: 0, Max.: 255
    		9 (pulse): MAX COOL
    54 (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 B1447 is not output.


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

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.CHECK REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY

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

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

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

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

    OK:
    DTC B1447 is not output.


NG
Go to step 5
OK

END (REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY 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 B1447 is not output.


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

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)