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:
Following Distance
Stay at least twice as far behind the
vehicle ahead as you would when
driving the vehicle without a trailer.
This can help to avoid situations
that require heavy braking and
sudden turns. ...
Heated Mirrors
(Rear Window Defogger):
Press to heat the mirrors.
See Dual Automatic Climate Control
System. ...
Convenience Net (Sedan and Coupe)
The vehicle may have a
convenience net in the rear.
Put small loads behind the net.
It can also be positioned into an
envelope style to hold smaller items.
The net is not for heavier loads.
St ...