Chevrolet Impala 2007 Impala Owner's Manual page 350

5. Remove the two hex nuts.
6. Pull out the taillamp assembly and disconnect
the wiring harness.
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7. Turn the bulb socket counterclockwise to
remove it.
8. Install a new bulb.
9. Turn the bulb socket clockwise to reinstall it.
10. Reverse Steps 1 through 6 to reinstall the
taillamp assembly.
When reinstalling the taillamp assembly,
make sure that you line up the four posts
on the assembly with the slots in the
vehicle.