Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
, and an Advisor can run a check.
See also:
Reading Lamps
Press the button near each lamp to turn them on or off. ...
Driving on Wet Roads
Rain and wet roads can reduce vehicle traction and affect your ability to stop and accelerate.
Always drive slower in these types of driving conditions and avoid driving through large puddles and dee ...
Playing a CD-R or CD-RW MP3
(Tune): Turn to select MP3/WMA files.
SEEK: Press to go to the start of the track, if more than 10 seconds have played. Press and hold or press multiple times to continue moving backward through tr ...