DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The REC/FRS 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 air inlet damper to any position, which controls the intake air settings (fresh, fresh/recirculation and recirculation).

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
B1442/42	The air inlet damper position does not change even if the air conditioning amplifier assembly operates the REC/FRS damper servo motor.	REC/FRS damper servo motor Air conditioning harness assembly Air conditioning amplifier assembly

WIRING DIAGRAM

Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (REC/FRS 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
Air Inlet Damper Targ Pulse	REC/FRS damper servo motor target pulse / Min.: 9, Max.: 37	for LHD Recirculation: 37 (pulse) Fresh: 9 (pulse) for RHD Recirculation: 9 (pulse) Fresh: 37 (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 REC/FRS DAMPER SERVO MOTOR

Replace the REC/FRS 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 B1442/42 is not output	A
DTC B1442/42 is output	B

B

Go to step 3

A

END (REC/FRS 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 B1442/42 is not output	A
DTC B1442/42 is output	B

B

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

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