DTC B1447/47: Rear Air Mix Damper Control Servo Motor Circuit [10/2014 - ]: Description

The No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) sends pulse signals to inform the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the rear is controlled.

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.