Horn
Press 
on the steering wheel pad
to sound the horn.
See also:
Remote Keyless Entry (RKE) System
The Remote Keyless Entry (RKE) transmitter will work up to 20 m (65 ft) away
from the vehicle.
RKE without Remote Start Shown
Press the button to extend the key. The key can be used for all lock ...
Some Other Rainy Weather Tips
• Besides slowing down, allow some extra
following distance. And be especially careful
when you pass another vehicle. Allow yourself
more clear room ahead, and be prepared to
have your view rest ...
Potential Issues
Some OnStar services are disabled
after five days. OnStar cannot
perform Remote Door Unlock or
Stolen Vehicle Assistance after the
vehicle has been off continuously
for five days. After five ...