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:
Touch-Sensitive Screen Buttons
Touch-sensitive screen buttons are located on the screen. When a screen button
has been selected, a beep sounds. Screen buttons are highlighted when a feature
is available. ...
Entry Lighting
The headlamps, taillamps, license plate lamps, back—up lamps, dome lamps,
and most of the interior lights turn on briefly, when is pressed on the Remote
Keyless Entry (RKE) transmitter, or when the ...
Engine Compartment
Fuse Block
(CTS Coupe and Sedan)
The underhood fuse block is
located on the left side of the engine
compartment.
Lift the fuse block cover to access
the fuses.
The vehicle may not be equipped
with all of the fuses and rel ...