Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Starting the Vehicle with a Low Transmitter Battery
If the transmitter battery is weak, the DIC may display NO REMOTE DETECTED
when you try to start the vehicle. The REPLACE BATTERY IN REMOTE KEY message
may also be displayed at this time.
To star ...
Overview
Replete with a dynamic design, advanced technology and a unique blend of
luxury and performance, the Cadillac XLR brings a striking new presence to the
elite luxury roadster class. The vehicle und ...
DIC Operation and Displays
Press the DIC buttons to access the
different displays.
(Trip/Fuel): Press to scroll
through the trip and fuel displays.
See “Trip/Fuel Display Menu Items”
following for more information.
...