Cadillac 2011 CTS Coupe Owner's Manual page 361

To replace one of these bulbs:
1. Open the liftgate. See
information.
2. Push the left end of the lamp
assembly towards the right.
3. Turn the lamp assembly down to
remove it from the liftgate.
for more
A. Bulb Socket
B. Bulb
C. Lamp Assembly
4. Turn the bulb socket (A)
counterclockwise to remove it
from the lamp assembly (C).
5. Pull the bulb (B) straight out of
the bulb socket.
6. Push the replacement bulb
straight into the bulb socket and
turn the bulb socket clockwise to
install it into the lamp assembly.
7. Turn the lamp assembly into
the liftgate engaging the clip
side first.
8. Push on the lamp side opposite
the clip until the lamp assembly
snaps into place.
Fog Lamp (Up
Level Only)
License Plate Lamp
For replacement bulbs not listed
here, contact your dealer.
H11LL
W5WLL