Dtc B1445 Cool Air Bypass Damper Control

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS PULSE)

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

DTC B1445 Cool Air Bypass Damper Control


DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass 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 outlet damper to any position, which controls the air outlet changes.
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
B1445
The air outlet damper position does not change for 30 seconds or more when the air conditioning amplifier assembly operates the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).
  1. No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo)
  2. Air conditioning harness assembly
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1445 Cool Air Bypass Damper Control


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS PULSE)

  1. Use the Data List to check if the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) is functioning properly (Click here).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Cool Air Bypass Pulse
    		No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) target pulse / Min.: 0, Max.: 255
    1. Shut and DEF mode: 6 (pulse)
    2. Shut: 28 (pulse)
    3. Open: 57 (pulse)
    		-
    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
    NG
    		C


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
A


2.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

  1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).

    1. for LHD: Click here.
    2. for RHD: Click here.
    HINT:
    Since the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) with a new or normally functioning one.

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1445 is not output
    		A
    DTC B1445 is output
    		B


B
Go to step 3
A

END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [COOLER BYPASS DAMPER SERVO] IS FAULTY)

3.REPLACE AIR CONDITIONING HARNESS ASSEMBLY

  1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one.

    1. for LHD: Click here.
    2. for RHD: Click here.

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1445 is not output
    		A
    DTC B1445 is output
    		B


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
A

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)