Upgrading to LED Headlights on a 2006 Sierra 1500 autowebnews.org

Disconnect the Battery: Always start by disconnecting the negative terminal of the battery to prevent any electrical shorts.

Access the Retaining Bolts: Open the hood. The headlight is secured by three bolts. The top two are easily visible. To access the third (inner) bolt, you must partially remove the front grille. This is done by removing the several Phillips-head screws along the top edge of the grille (under the hood) and the plastic push-pins or screws in the radiator cover. Gently pull the top of the grille forward; you do not need to fully remove it, just flex it enough to reach the inner bolt with your socket.

Remove the Assembly: Unscrew and remove all three 10mm bolts. Carefully pull the entire headlight assembly straight forward out of the truck. Reach behind it and disconnect the main wiring harness plug by pressing the release tab and pulling it apart. Set the old assembly aside.