The air mix damper servo sends pulse signals to inform the A/C amplifier of the damper position. The A/C amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (passenger seat) to any position, which adjusts the amount of air passing the heater core after passing the evaporator to control the blowing temperature. HINT:

Confirm that no mechanical problem is present because this diagnostic code can be out put when either a damper link or damper is mechanically locked.


Detection Item

Trouble Area


Air mix damper position sensor value does not change even if air conditioner amplifier assembly operates air mix servo motor.

• Air mix control servo motor

• Air conditioning harness assembly

• A/C amplifier

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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