Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Cellular and GPS Antennas
Avoid placing items over or near
the antenna to prevent blocking
cellular and GPS signal reception.
Cellular reception is required for
OnStar to send remote signals to
the vehicle. ...
Universal Remote System Operation
Press and hold the appropriate button for at least half of a second. The indicator
light will come on while the signal is being transmitted.
Reprogramming Universal Home Remote Buttons
Any of the ...
Customer Assistance Offices (U.S. and Canada)
Cadillac encourages customers to call the toll-free number for assistance. However,
if a customer wishes to write or e-mail Cadillac, the letter should be addressed
to:
United States
Cadillac Cu ...