Dtc B1445/45 Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Air Conditioning. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

REPLACE COOL AIR BY-PASS CONTROL SERVO MOTOR

DTC B1445/45 Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit


DESCRIPTION

The damper servo (cool air by-pass) sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the damper to any position. As a result, when the A/C is operating, the temperature of the air blowing toward the passenger's head area is controlled.
HINT:
Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DTC No.
DTC Detection Condition
Trouble Area
B1445/45
Cool air by-pass damper control servo motor value does not change even if A/C control operated cool air bypass damper control servo motor
  1. Cool air by-pass damper control servo motor
  2. Air conditioning harness
  3. A/C amplifier

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1445/45 Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the intelligent tester main switch on.

  1. Expose the sensing portion of the solar sensor to light.

  1. Select the item below in the Data List, and read the display on the intelligent tester.


Data List / Air Conditioner:
Item
Measurement Item / Display (Range)
Normal Condition
Diagnostic Note
Cool Air Bypass Pulse
(A/B Damp Pls)
Passenger side cool air by-pass pulse / Min.: 0, Max.: 255
CLOSE: 50 (pulse)
OPEN: 8 (pulse)
-
OK:
The display is as specified in the normal condition column.

Result:

Result
Proceed to
NG
A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
B
OK (When troubleshooting according to the DTC)
C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPAIR AIR CONDITIONING AMPLIFIER
A


2.REPLACE COOL AIR BY-PASS CONTROL SERVO MOTOR
HINT:
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal.

  1. Check for DTCs.

    Result:
    Result
    		Proceed to
    DTC B1445/45 is output
    		A
    DTC B1445/45 is not output
    		B


B
END
A

REPAIR AIR CONDITIONING HARNESS