Push the turn signal lever away from you and release, to turn the high beams on. To return to low beams, push the lever again or pull it toward you and release.

This indicator light turns on in the instrument cluster when the high-beam headlamps are on.
Exterior Lamp Controls
Flash-to-Pass#13-00-89-003: Vehicle Software Enhancements - (Mar 27, 2013)
Subject:Vehicle Software EnhancementsModels: 2014 and Prior GM Passenger Cars and Light Duty Trucks The new technology systems on today’s vehicles may have software enhancements availableto add additional functionality after the vehicle is produced. To meet customer expectations,GM may make th ...