Pontiac G6 2010 Owner's Manual page 320

To replace one of these bulbs:
1. Open the trunk. See Trunk on page 3-11.
2. Remove the convenience net.
3. Remove the two wing nuts from the trunk trim and
pull back the trunk trim to expose the hex nuts.
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4. Remove the three hex nuts retaining the taillamp
assembly.
5. Pull the assembly off to the side to release it from
the rear of the vehicle.
6. Turn the bulb socket counterclockwise to remove
from the taillamp assembly.
7. Pull the bulb from the socket.
8. Push the new bulb into the socket until it clicks.
9. Turn the bulb socket clockwise to reinstall into the
taillamp assembly.
10. Push the taillamp assembly back into the rear of
the vehicle.
11. Reinstall the three hex nuts retaining the taillamp
assembly.
12. Reinstall the trunk trim and the two wing nuts.