DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (REAR AIR OUTLET DAMPER SERVO MOTOR)
CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)
CHECK REAR AIR OUTLET DAMPER SERVO MOTOR
CHECK NO. 2 AIR CONDITIONING HARNESS ASSEMBLY
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.
- 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 |
| 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
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (REAR 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 |
| 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.
Result| Result | Proceed to |
| OK (Checking from the DTC) | A |
| OK (Checking from the PROBLEM SYMPTOMS TABLE) | B |
| NG | C |
| | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| 2.CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER) |
Disconnect the K19 No. 2 air conditioning harness assembly connector.
Disconnect the E36 amplifier connector.
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 | Always | 10 kΩ or higher |
| E36-13 (RBUS) - Body ground |
| E36-14 (RBBU) - Body ground |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.CHECK REAR AIR OUTLET DAMPER SERVO MOTOR |
Replace the rear air outlet damper servo motor ().
- Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.
Check for DTCs ().
Result| Result | Proceed to |
| DTC B1449/49 is not output | A |
| DTC B1449/49 is output | B |
| A | |
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| END (REAR AIR OUTLET DAMPER SERVO MOTOR IS DEFECTIVE) |
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| 4.CHECK NO. 2 AIR CONDITIONING HARNESS ASSEMBLY |
Replace the No. 2 air conditioning harness assembly ().
Check for DTCs ().
Result| Result | Proceed to |
| DTC B1449/49 is not output | A |
| DTC B1449/49 is output | B |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| A | |
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| END (NO. 2 AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE) |
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