GMC 2006 Sierra - Manual (Page 480)

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. Reinstall the back plate into the lamp assembly.
6. Reinstall the lamp assembly and tighten the screws.
Pickup Box Identification and
Fender Marker Lamps
To replace a pickup box identification or fender marker
lamp bulb, do the following:
1. Remove the screws and lamp assembly.
2. Unplug the lamp assembly harness.
3. Gently pry the individual lamp from the lamp
assembly.
4. Unplug the lamp.
5. Plug in a new lamp and snap it into the assembly.
6. Reinstall the lamp assembly.
Taillamps, Turn Signal, Stoplamps
and Back-up Lamps
To replace one of these bulbs, do the following:
1. Open the tailgate. Tailgate on page 2-14 for more
information.
2. Remove the two rear
lamp assembly screws
near the tailgate
latch and pull out the
lamp assembly.
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