Horn
Press 
on the steering wheel pad to sound the horn.
See also:
When the System Does Not
Seem to Work Properly
The following messages may be
displayed on the DIC:
PARKING ASSIST OFF: This
message occurs if the driver
disables the system or if vehicle is
driven above 8 km/h (5 mph) in
R (Reverse).
S ...
Collision Damage Repair (U.S. and Canada)
If the vehicle is involved in a collision and it is damaged, have the damage
repaired by a qualified technician using the proper equipment and quality
replacement parts. Poorly performed collision r ...
Powertrains
Direct injection technology helps the Cadillac CTS offer more power while
maintaining fuel economy and lowering emissions. It delivers fuel more precisely
to increase the efficiency of combustion. ...