Certain vehicles fail to comply with the requirements of CMVSS 108 - Lamps, Reflective Devices and Associated Equipment. 1). The required cap designed to disable the headlamp horizontal aim may not have been installed during vehicle assembly. 2). A cap may have been inadvertently installed to disable the vertical aiming screw. 3). An adjustment mechanism allows aiming of the low beam relative to the high beam. Correction: Dealers will affect repairs.