GMC 2002 Sierra - Manual (Page 417)

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4. If a CHMSL bulb is replaced, put the new bulb into
the socket and press it in until it is tight.
If a cargo lamp is replaced, put a new cargo lamp
bulb into the socket and press it in until it is tight
before turning the socket counterclockwise.
5. Put the bulb holder back plate into the lamp housing.
6. Reinstall the lamp assembly and tighten the screws.
Pickup Box Identification Lamps/Fender
Marker Lamps
1. Remove the screws and lamp assembly.
2. Unplug the lamp assembly harness.
3. Use a screwdriver to gently pry the individual lamp
from the lamp housing.
4. Unplug the lamp at the connector.
5. Plug in a new lamp and snap it into the housing.
6. Reinstall the lamp housing.