Air Intake Actuator Description

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

The air intake actuator is operated by signals from the climate control unit, and opens and closes the air intake door.
The air intake actuator has a built-in sliding contact that is linked to the motor.

System wiring diagram

Fig 1: Air Intake Actuator System Wiring Diagram

Courtesy of MAZDA MOTORS CORP.

Operation

The CPU of the climate control unit sends an air intake signal based on the input signal from the switch and turns the transistor on.
The motor of the air intake actuator operates until the sliding contact rotates to a target position.
When the motor has rotated to the target position, the sliding contact goes off.
The motor drive circuit is cut, and the motor stops.

Fig 2: Air Intake Actuator Operation Diagram
Courtesy of MAZDA MOTORS CORP.