Dtc B1445/45 Passenger Side 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 GTS (COOL AIR BYPASS PULSE, COOL AIR BYPASS ACTUAL PULSE)

CHECK COOL BYPASS DAMPER SERVO MOTOR

CHECK AIR CONDITIONING HARNESS ASSEMBLY

CHECK FOR DTC

DTC B1445/45 Passenger Side Cool Air Bypass Damper Control


DESCRIPTION

The cool bypass damper servo motor 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 cool bypass damper servo motor to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the head area is controlled.
HINT:
Confirm that no mechanical problem is present because this trouble code can be output when either a damper link or damper is mechanically locked.

DTC Code
DTC Detection Condition
Trouble Area
B1445/45
The cool air bypass damper position does not change even if the air conditioning amplifier assembly operates the cool bypass damper servo motor.
  1. Cool bypass damper servo motor
  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 B1445/45 Passenger Side Cool Air Bypass Damper Control


INSPECTION PROCEDURE

1.READ VALUE USING GTS (COOL AIR BYPASS PULSE, COOL AIR BYPASS ACTUAL PULSE)

  1. Use the Data List to check if the cool bypass damper servo motor is functioning properly (Click here).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Cool Air Bypass Pulse
    		Cool bypass damper servo motor target pulse / Min.: 128, Max.: 383
    1. Shut: 134 (pulse)
    2. Open: 185 (pulse)
    1. Displayed between 134 and 185 pulse
    2. Cool bypass damper servo motor system malfunction
    Cool Air Bypass Actual Pulse
    		Cool bypass damper servo motor actual pulse / Min.: 128, Max.: 383
    1. Shut: 134 (pulse)
    2. Open: 185 (pulse)
    1. Displayed between 134 and 185 pulse
    2. Cool bypass damper servo motor system malfunction
    OK:
    When the cooler temperature switch is turned, the actual pulse changes following the target pulse.
    Result
    Result
    		Proceed to
    Target pulse changes but actual pulse does not change
    		A
    Target pulse and actual pulse do not change
    		B
    Actual pulse changes following the target pulse (When troubleshooting according to the DTC)
    		C
    Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table)
    		D


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

C
Go to step 4

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


2.CHECK COOL BYPASS DAMPER SERVO MOTOR

  1. Replace the cool bypass damper servo motor.

    1. for LHD: Click here
    2. for RHD: Click here
    HINT:
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1445/45 is not output.


NG
Go to step 3
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

3.CHECK AIR CONDITIONING HARNESS ASSEMBLY

  1. Replace the air conditioning harness assembly with a new or known good one.

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

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1445/45 is not output.


NG
END (COOL BYPASS DAMPER SERVO MOTOR WAS DEFECTIVE)
OK

END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

4.CHECK FOR DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1445/45 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)