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:
Specification
Use and ask for licensed engine
oils with the dexos1™ approved
certification mark. Engine oils
meeting the requirements for the
vehicle should have the dexos1
approved certification mark.
T ...
Competitive Driving Mode
To select this optional handling
mode, press the TCS/StabiliTrak
button quickly two times and
STABILITRAK COMPETITIVE
MODE displays in the Driver
Information Center (DIC). While in
the Sta ...
Exterior Lighting
The exterior lamp control is
located toward the end of the turn
signal/lane change lever.
: Turn the band with this
symbol on it to operate the exterior
lamps.
The exterior lamp control h ...