Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Uniform Tire Quality Grading
Quality grades can be found where applicable on the tire sidewall between
tread shoulder and maximum section width.
For example:
Treadwear 200 Traction AA
Temperature A
The following info ...
Battery
If the vehicle is a hybrid, see the hybrid supplement for more information.
Refer to the replacement number on the original battery label when a new battery
is needed. See Engine Compartment Overvi ...
Place a Call Using a Stored
Number
1. Push . System responds:
“OnStar ready.”.
2. Say “Call <name tag>.”.
System responds: “OK,
calling <name tag>.” ...