GMC SIERRA DENALI 2002 Manual page 317

5. Remove the old bulb from the bulb socket.
6. Put a new bulb into the bulb socket. Use care not to
touch the bulb with your fingers or hands.
7. Put the bulb socket back into the turn signal housing
and turn it clockwise until it locks.
8. Put the turn signal housing back into the vehicle
placing the hook and posts on the inner side into the
alignment holes first, then the outer side into the
retainer bracket until you hear a click.
9. Put the headlamp assembly back into the vehicle.
6-40
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp
1. Remove the screws and lift off the lamp assembly.