DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (FRONT AIR MIX DAMPER SERVO MOTOR)
CHECK FRONT AIR MIX DAMPER SERVO MOTOR
CHECK AIR CONDITIONING HARNESS ASSEMBLY
DTC B1457/57 Driver Side Air Outlet Damper Control Servo Motor Circuit
DESCRIPTION
The front air mix damper servo motor (for driver side rear air flow) 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 front air mix damper (for driver side rear air flow) to any position. As a result, the amount of air that has passed through the evaporator and is passing through the heater core is adjusted, and the temperature of the air blowing toward the rear driver side 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 |
| B1457/57 |
The air mix damper position does not change even if the air conditioning amplifier assembly operates the front air mix damper servo motor. |
Front air mix damper servo motor (for driver side rear air flow)
Air conditioning harness assembly
Air conditioning amplifier assembly
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (FRONT AIR MIX 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 Mix Servo Targ Pls(F&R D) |
Front air mix damper servo motor (for driver side rear air flow) target pulse /
Min.: 13, Max.: 41 (for LHD)
Min.: 5, Max.: 33 (for RHD) |
for LHD
MAX COOL: 13 (pulse)
MAX HOT: 41 (pulse)
for RHD
MAX COOL: 33 (pulse)
MAX HOT: 5 (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 HARNESS ASSEMBLY ()
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| 2.CHECK FRONT AIR MIX DAMPER SERVO MOTOR |
Replace the front air mix damper servo motor (for driver side rear air flow).
- 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 B1457/57 is not output | A |
| DTC B1457/57 is output | B |
| A | |
| |
| END (FRONT AIR MIX DAMPER SERVO MOTOR IS DEFECTIVE) |
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| 3.CHECK AIR CONDITIONING HARNESS ASSEMBLY |
Replace the air conditioning harness assembly.
Check for DTCs ().
Result| Result | Proceed to |
| DTC B1457/57 is not output | A |
| DTC B1457/57 is output | B |
| | REPLACE AIR CONDITIONING HARNESS ASSEMBLY ()
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| A | |
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| END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE) |
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