2003 GMC Yukon Owner's Manual - Page 411

Halogen Bulbs Headlamps {CAUTION: Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package. 1. Your vehicle is equipped with two pins, remove the two pins on the top of the headlamp assembly. To remove the pins, turn the outer pin outward and pull it straight up. To remove the inner pin, turn it in and pull it straight up. 5-53