Pontiac 2007 G6 Owner's Manual page 366

To replace one of these bulbs, do the following:
1. Open the trunk. See Trunk on page 113
for more information.
2. Remove the convenience net, if the vehicle
has one.
3. Remove the two wing nuts from the trunk trim
to expose the hex nuts.
4. Remove the three hex nuts retaining the
taillamp assembly.
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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.
7. Pull the bulb from the bulb socket.
8. Install a new bulb.
9. Reverse Steps 3 through 5 to reinstall the
taillamp assembly.