Intake Air Control - Single Zone Manual System

The intake air source is controlled manually by pressing the fresh/recirculated air switch located on the control panel. When pressed, the ATC module will illuminate the switch tell-tale Light Emitting Diode (LED) and close the air intake door. A second press of the switch will cause the ATC module to extinguish the switch LED and open the air intake door, allowing fresh air to enter the cabin.

NOTE: The ATC module will reduce the amount of fresh air entering the cabin to reduce the ram effect caused by forward motion of the vehicle.

When recirculated air is selected, the ATC module will return the air intake door to the open position after a period of 3 minutes. This helps prevent misting within the cabin. The 3 minute time period for recirculated air can be overridden by pressing and holding the fresh/recirculated air switch until the switch LED flashes 3 times. The air intake door will now remain closed until the next drive cycle.

The ATC module controls the position of the air intake door by providing LIN bus messages to the air intake door stepper motor. A Hall effect sensor located within the stepper motor informs the ATC module that movement of the stepper motor is taking place.