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Last Modified: 11-27-2007 1.6 C
Service Category: Vehicle Interior Section: Heating/Air Conditioning
Model Year: 2008 Model: LX570 Doc ID: RM000002SLN009X
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 LX570)

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 stored 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

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (AIR OUTLET DAMPER SERVO MOTOR)

(a) 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

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)

-

OK:

The display is as specified in the normal condition.

OK

2.

CHECK AIR OUTLET DAMPER SERVO MOTOR (OPERATION)

(a) Replace the air outlet damper servo motor (for front passenger side mode) HEATING / AIR CONDITIONING: FRONT AIR CONDITIONING UNIT: DISASSEMBLY (2008 LX570) .

HINT:

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

NEXT

3.

CHECK FOR DTC

(a) Clear the DTCs HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

(b) Check for DTCs HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

OK:

DTC B1448 is not output.

OK