B1449

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1449/49: Rear Air Outlet Damper Control Servo Motor Circuit
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.





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





OK:

The display is as specified in the normal condition.

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

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

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:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. REPLACE REAR AIR OUTLET DAMPER SERVO MOTOR

(a) Replace the rear air outlet damper servo motor Disassembly.

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

NEXT -- Continue to next step.

4. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1449 is not output.

NG -- REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY Disassembly

OK -- REPLACE REAR AIR OUTLET DAMPER SERVO MOTOR Disassembly