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:
Increasing Speed While Using Cruise Control
If the cruise control system is already activated,
. Press and hold the +RES button on the steering wheel until the desired speed
is reached, then release it.
. To increase vehicle speed in small ...
Ashtrays
There may be an ashtray located under the climate control system on the
instrument panel. Press the door to release the ashtray.
To empty the ashtray, remove it from the instrument panel by holdin ...
Turn Signal Indicator
The vehicle has a turn signal indicator on the mirror. An arrow on the mirror
flashes in the direction of the turn or lane change. ...