Chevrolet 2001 Impala Owner's Manual page 323

To remove the assembly do the following:
1. Open the hood.
2. Remove the air baffle.
3. Remove the two headlamp fasteners by pulling up
on them.
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4. Gently 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.