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:
Video Screen
The video screen is located in the overhead console.
To use the video screen:
1. Push the release button located on the overhead console.
2. Move the screen to the desired position.
When the video ...
Ride Control System Messages
ALL WHEEL DRIVE OFF
If your vehicle has the All-Wheel Drive (AWD) system, this message displays when
the rear drive system is overheating. This message turns off when the rear drive
system cools ...
Uniform Tire Quality Grading
Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width.
For example: ...