Horn
Pressa 
on the steering wheel pad
to sound the horn.
See also:
Universal Remote System Programming
This system provides a way to replace up to three remote control transmitters used to activate devices such as garage door openers, security systems, and home automation devices.
Do not use the Uni ...
Using Voice Commands During a Planned Route
Cancel Route
1. Push X. System responds: “OnStar ready,” then a tone. Say “Cancel route.”
System responds: “Would you like to cancel route directions to your destination?”
2. Say “Ye ...
Recommended Fuel
Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when dri ...