1999 GMC Envoy Owner's Manual - Page 284
1999 GMC Envoy Manual
Page 284 highlights
yellowblue 5. Put the bulb socket into the lamp assembly and twist it clockwise until it is tight. 6. Put the headlamp assembly back into the vehicle. Install the two retaining clips. 3. Pull the assembly away from the vehicle. 4. Turn the socket counterclockwise to remove it. Push the tab in while you turn the socket counterclockwise. 5. Holding the base of the bulb, pull the bulb straight out of the socket. 6. Push the new bulb straight into the socket until it clicks. 2. Remove the two screws from the lamp assembly. 7. Put the socket into the assembly and turn the socket clockwise until it locks in place. 8. Install the lamp assembly. Install and tighten the screws. 9. Close the liftgate. Taillamps 1. Open the liftgate. 6-34