DTC B1448/48 Passenger Side FACE Servo Motor Circuit

DESCRIPTION

The air outlet damper servo motor (for front passenger side mode) 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 outlet damper (for front passenger side mode) to any position, which controls the air outlet changes.

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
B1448/48	The air outlet damper position does not change even if the air conditioning amplifier assembly operates the air outlet damper servo motor.	Air outlet damper servo motor (for front passenger side mode) Air conditioning harness assembly Air conditioning amplifier assembly

WIRING DIAGRAM

Dtc B1448/48 Passenger Side Face Servo Motor Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (AIR OUTLET 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
A/O Damper FACE Pos(P)	Air outlet damper servo motor (for front passenger side mode) target pulse / Min.: 6, Max.: 117 (for LHD) Min.: 9, Max.: 120 (for RHD)	for LHD FACE1: 117 (pulse) FACE2: 109 (pulse) B/L1: 93 (pulse) B/L2: 81 (pulse) FOOT-F: 41 (pulse) FOOT-R: 41 (pulse) FOOT-D: 52 (pulse) F/D: 18 (pulse) DEF: 6 (pulse) for RHD FACE1: 9 (pulse) FACE2: 17 (pulse) B/L1: 33 (pulse) B/L2: 45 (pulse) FOOT-F: 85 (pulse) FOOT-R: 85 (pulse) FOOT-D: 74 (pulse) F/D: 108 (pulse) DEF: 120 (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 AIR OUTLET DAMPER SERVO MOTOR (FOR FRONT PASSENGER SIDE MODE)

Replace the air outlet damper servo motor (for front passenger side mode).

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 B1448/482 is not output	A
DTC B1448/48 is output	B

B

Go to step 3

A

END (AIR OUTLET DAMPER SERVO MOTOR [FOR FRONT PASSENGER SIDE MODE] 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 B1448/48 is not output	A
DTC B1448/48 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