Unable to Connect to OnStar Message
If there is limited cellular coverage
or the cellular network has reached
maximum capacity, this message
may come on. Push 
to try the
call again or try again after driving a
few miles into another cellular area.
See also:
Anti-theft Alarm System Messages
THEFT ATTEMPTED
This message displays if the vehicle detects a tamper condition. ...
Passing
More passing distance is needed when towing a trailer. The combination will not
accelerate as quickly and is longer so it is necessary to go much farther beyond
the passed vehicle before returning ...
Brake System Warning Light
With the ignition on, the brake system warning light comes on when the parking
brake is set. If the vehicle is driven with the parking brake engaged, a chime sounds
when the vehicle speed is great ...