Horn
Press 
on the steering wheel
pad to sound the horn.
See also:
Fuel System Messages
FUEL LEVEL LOW
This message displays when the vehicle is low on fuel. Refuel as soon as possible. ...
Customer Assistance for Text Telephone (TTY) Users (U.S. and Canada)
To assist customers who are deaf,
hard of hearing, or speech-impaired
and who use Text Telephones
(TTYs), Buick has TTY equipment
available at its Customer Assistance
Center. Any TTY user ca ...
Turning the Rear Vision Camera
System On or Off
To turn the RVC system on or off:
1. Shift into P (Park).
2. Press the CONFIG button to
enter the configure menu
options.
3. Select Display.
4. Select Rear Camera Options.
5. Select Camera. ...