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 
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Advisor can run a check.
See also:
Dome Lamps
The dome lamp is located in the overhead console.
To change the dome lamp settings, press the following:
(Dome Lamp Override): Turns the lamp off, even when a door is open.
(Door): The la ...
Vehicle Speed Messages
SELECTED SPEED LIMIT EXCEEDED
This message is displayed when the vehicle speed is greater than the set
speed. See "Speed Warning" under Driver Information Center (DIC). ...
Unlocked Door Anti Lock Out
When on, this feature will keep the driver door from locking when the door
is open. If Off is selected, the Delayed Door Lock menu will be available and
the door will lock as programmed through this ...