Blower Motor Control Selector
WARNING: This page is about a different car, the 1998 Dodge Intrepid and 1998 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
Blower motor/fan has 14 automatic speeds controlled by blower motor power module through pulse width modulated signals from BCM. Blower motor speed can be manually controlled by rotating blower motor control selector.