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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: RM000002ROO009X
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 LX570)

DTC

B1449/49

Rear Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The rear air outlet 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 rear air outlet damper to the appropriate position, which controls the air outlet modes.

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

B1449/49

The rear air outlet damper position does not change even if the air conditioning amplifier assembly operates the rear air outlet damper servo motor.
  • Rear air outlet damper servo motor
  • No. 2 air conditioning harness assembly
  • Harness or connector between No. 2 air conditioning harness assembly and air conditioning amplifier assembly
  • Air conditioning amplifier assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (REAR 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

Air Outlet Servo Pulse (R)

Rear air outlet damper servo motor target pulse /

Min.: 7, Max.: 83

FOOT: 7 (pulse)

B/L: 42 (pulse)

FACE: 83 (pulse)

-

OK:

The display is as specified in the normal condition.

OK

2.

CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)


(a) Disconnect the K19 No. 2 air conditioning harness assembly connector.

(b) Disconnect the E36 amplifier connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K19-2 (RBUG) - E36-12 (RBUG)

Always

Below 1 Ω

K19-3 (RBUS) - E36-13 (RBUS)

K19-4 (RBBU) - E36-14 (RBBU)

E36-12 (RBUG) - Body ground

E36-13 (RBUS) - Body ground

Always

10 kΩ or higher

E36-14 (RBBU) - Body ground
OK

3.

CHECK REAR AIR OUTLET DAMPER SERVO MOTOR (OPERATION)

(a) Replace the rear air outlet damper servo motor HEATING / AIR CONDITIONING: REAR 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

4.

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 B1449 is not output.

OK