Position the headlamp unit (2) close enough to the front of the vehicle to reconnect the engine compartment wire harness connectors to the headlamp bulb connector receptacle and to the position lamp bulb pigtail connector (5).Position the headlamp unit into the mounting collar (1) on the face of the front end module carrier.Install the retainer (3) over the headlamp unit and against the mounting collar with the retainer screw tabs in alignment with the screw holes in the collar.Install and tighten the four screws that secure the retainer to the collar. Tighten the screws until they are fully seated.Reinstall the grille panel onto the front of the vehicle. (Refer to 23 - BODY/EXTERIOR/GRILLE - INSTALLATION).Reconnect the battery negative cable.Confirm proper headlamp alignment. (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR - STANDARD PROCEDURE - FRONT LAMP AIMING).