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	Cool air by-pass damper control servo motor Air conditioning harness A/C amplifier

WIRING DIAGRAM

Dtc B1445/45 Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit. AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

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

Expose the sensing portion of the solar sensor to light.

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.

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

LEXUS IS250, IS220d / GSE20 ALE20

AIR CONDITIONING

Lexus IS250 IS220d GSE20 ALE20

AIR CONDITIONING SYSTEM

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