Air Source Select Switch
WARNING: This page is about a different car, the 2002 Isuzu Axiom. However, it is still accessible from the selected car via links, so may be relevant.
Press this button to select either Fresh Air Intake or CIRC (inside air circulation). There is an indicator light inside the button. This light indicates that the CIRC mode is "ON".
Fresh Air Intake is the default setting for both DEFROST and FOOT/DEFROST.