GM Service Manual Online
For 1990-2009 cars only

The Adaptive Forward Lighting System (AFL) pivots the headlamps horizontally to provide greater road illumination while turning. To enable AFL, set the exterior lamp switch on the multifunction lever to the AUTO position. Moving the switch out of the AUTO position will deactivate the system. AFL will operate when the vehicle speed is greater than 2 mph (3 km/h). AFL will not operate when the transmission is in R (Reverse). AFL is not immediately operable after starting the vehicle; driving a short distance is required to calibrate the AFL. See Headlamps.