Cadillac 2007 - Manual (Page 451)

2. Remove the two
screws from the
taillamp assembly.
3. Pull the taillamp assembly straight back to
remove.
4. Turn the bulb socket counterclockwise to
remove it from the taillamp assembly.
5. Pull the bulb straight out from the socket.
6. Press a new bulb into the socket, insert it into
the taillamp assembly and turn the bulb
socket clockwise until it clicks.
7. Reinstall the taillamp assembly and tighten
the screws.
451