PACCAR is recalling certain model year 2013-2014 Kenworth T680 and T880 trucks, manufactured from January 18, 2012, through February 1, 2013; and model year 2013-2014 Peterbilt 579 and 567 vehicles, manufactured from January 20, 2012, through January 31, 2013. The Exterior Lights Self-Test switch is intended to be used when the vehicle is parked. If the switch is pressed while the vehicle is in motion, the Exterior Lights Self-Test switch will cause all exterior lighting to be extinguished.