Horn
Press 
on the steering wheel pad
to sound the horn.
See also:
Reporting Safety Defects to General
Motors
In addition to notifying NHTSA (or Transport Canada) in
a situation like this, please notify General Motors.
Call 1-800-521-7300, or write:
Buick Customer Assistance Center
P.O. Box 33136
Detroi ...
OnStar Mobile App
With an iPhone® or
Android™-based mobile device, an
OnStar mobile app can be
downloaded. The vehicle can be
remote started, if equipped, or the
doors can be unlocked from
anywhere there ...
Setting the Clock (Radio with CD)
The clock menu can be only be used with the radio on while in ON/RUN or ACC/ACCESSORY.
To set the time: 1. Press the CONFIG button and select Time Settings or press
H.
2. Select Set Time.
3. Tu ...