Fresh/Re-Circulation Air

The IHKA module outputs the required position of the fresh/re-circulated air flap to the BC1, which then operates the servo accordingly.

Air re-circulation will be controlled automatically if AUTO is selected. This may be overridden by pressing the air re-circulation control. Re-circulated air will then remain manually controlled until the air re-circulation control is pressed again.

Fresh or recirculated air is controlled by a flap, driven by a servomotor controlled by the BC1. The IHKA requests the position of the servomotor and flap by sending a K-Bus message indicating either fresh or recirculated air. The Body Control Module (BC1) responds with a K-Bus message that is used to switch the LED on/off. The fresh/recirculation servomotor is driven end to end, and then switched-off on a timer. No servo position feedback is available.