Navigation
OnStar navigation requires the Directions and Connections service plan.
Push 
to receive directions or have them sent to the vehicle navigation screen. Destinations can also be forwarded to the vehicle from Google Maps™ or MapQuest.com. The OnStar mapping database is continuously updated. Visit www.onstar.com for coverage maps.
See also:
Engine Overheating
The vehicle has an indicator to warn of engine overheating. There is an engine
coolant temperature warning light on the vehicle's instrument panel. See Engine
Coolant Temperature Gauge on page ...
Horn
Press on the steering wheel pad to sound the horn. ...
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 days, OnS ...