DTC B1445/45 Passenger Side Cool Air Bypass Damper Control

DESCRIPTION

The cool air 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 air bypass damper 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 air bypass damper servo motor.	Cool air bypass damper servo motor Air conditioning harness assembly Air conditioning amplifier assembly

WIRING DIAGRAM

Dtc B1445/45 Passenger Side Cool Air Bypass Damper Control. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS DAMPER SERVO MOTOR)

Use the Data List to check if the servo motor is functioning properly.

Air Conditioner
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Cool Air Bypass Pulse	Cool air bypass damper servo motor target pulse / Min.: 6, Max.: 57	Shut: 6 (pulse) Open: 57 (pulse)	-

OK:
The display is as specified in the normal condition.

Result
Result	Proceed to
OK (Checking from the DTC)	A
OK (Checking from the PROBLEM SYMPTOMS TABLE)	B
NG	C

B

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

C

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()

A

2.CHECK COOL AIR BYPASS DAMPER SERVO MOTOR

Replace the cool air bypass damper servo motor.

for LHD:

for RHD:

HINT:

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

Clear the DTCs ().

Check for DTCs ().

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

B

Go to step 3

A

END (COOL AIR BYPASS DAMPER SERVO MOTOR IS DEFECTIVE)

3.CHECK AIR CONDITIONING HARNESS ASSEMBLY

Replace the air conditioning harness assembly.

for LHD:

for RHD:

Clear the DTCs ().

Check for DTCs ().

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

B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()

A

END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

HEATING / AIR CONDITIONING

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

AIR CONDITIONING SYSTEM for Automatic Air Conditioning System