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:
Hill and Mountain Roads
Driving on steep hills or through mountains is different than driving on flat or rolling terrain. Tips for driving in these conditions include:
► Keep the vehicle serviced and in good shape.
...
Adding Equipment to the Outsideof Your Vehicle
Things you might add to the outside of your
vehicle can affect the airflow around it. This may
cause wind noise and affect windshield washer
performance. Check with your dealer before
adding equip ...
Stoplamp,Taillamp, and Turn Signal Lamp
Driver Side Shown, Passenger Side Similar
A. Taillamp
B. Turn Signal Lamp
C. Stoplamp/Taillamp
To replace any one of these bulbs:
1. Open the trunk.
2. Remove the push pins securing the trunk ...