Dtc B1445/45 Passenger Side Cool Air Bypass Damper Control
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS DAMPER SERVO MOTOR)
CHECK COOL AIR BYPASS DAMPER SERVO MOTOR
CHECK AIR CONDITIONING HARNESS ASSEMBLY
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.
- 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 |
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
1.READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS DAMPER SERVO MOTOR) |
Use the Data List to check if the servo motor is functioning properly.
Air ConditionerTester 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.
ResultResult | 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 ()
|
|
|
| REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
2.CHECK COOL AIR BYPASS DAMPER SERVO MOTOR |
Replace the cool air bypass 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 ().
ResultResult | Proceed to |
DTC B1445/45 is not output | A |
DTC B1445/45 is output | B |
A | |
| |
END (COOL AIR BYPASS DAMPER SERVO MOTOR IS DEFECTIVE) |
|
3.CHECK AIR CONDITIONING HARNESS ASSEMBLY |
Replace the air conditioning harness assembly.
Check for DTCs ().
ResultResult | Proceed to |
DTC B1445/45 is not output | A |
DTC B1445/45 is output | B |
| REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
A | |
| |
END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE) |
|