Chevrolet Impala 2007 Impala Owner's Manual page 348

3. Remove the headlamp plastic retainer by
pulling it up.
4. Pull the headlamp assembly away from the
vehicle and remove the electrical connector.
5. Remove the round dust caps to gain access
to the bulbs.
6. Turn the old bulb counterclockwise and
remove it from the retaining ring by pulling
it away from the headlamp.
7. Remove the electrical connector from the bulb
by raising the lock tab and pulling the
connector away from the bulb's base.
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8. Install the electrical connector to the bulb.
9. Install the new bulb by inserting the smallest
tab on the bulb base into the matching notch
in the retaining ring. Turn the bulb a
quarter-turn clockwise until it stops.
10. Reverse Steps 1 through 5 to reinstall the
headlamp assembly.
When you reinstall the headlamp assembly,
make sure to line up the pin in the headlamp
assembly with the slot in the vehicle.