Remote Left In Vehicle
This allows the Remote Left In Vehicle reminder feature to be turned on or off. If on, the horn will chirp if a remote is left in the vehicle.
Press SELECT when Remote Left In Vehicle is highlighted. Turn the Menu knob to select On or Off.
Press SELECT to confirm the
selection. Press 
BACK to move to
the last menu.
See also:
How to Add Coolant to the
Recovery Tank
WARNING:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol and
it will burn if the engine parts are hot enough. Do
not spill coolant on a hot engine.
...
Automatic Crash Response
In a crash, built in sensors can automatically alert an
OnStar advisor who is immediately connected to
the vehicle to see if you need help. ...
Horn
Press near the horn symbols or press on the steering wheel pad to sound the horn. ...