Cadillac 2000 DeVille Owner's Manual page 336

5. Remove the bulb socket
dust cover and set aside.
6. Turn the headlamp
housing socket
counterclockwise to
unlock the socket from
the lamp housing.
8. Install the new bulb into the socket. Make sure that
the bulb is locked firmly into the bulb socket.
9. Reinstall the headlamp housing socket back into the
headlamp assembly.
10. To reinstall the headlamp assembly, see steps 2
through 5 in reverse.
7. Disconnect the bulb
from the socket by
pulling out the bulb.
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