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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: RM000002SM2009X
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 LX570)

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 stored 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

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (COOL AIR BYPASS 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

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.

OK

2.

CHECK COOL AIR BYPASS DAMPER SERVO MOTOR (OPERATION)

(a) Replace the cool air bypass damper servo motor 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 B1445 is not output.

OK