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:
Remote Keyless Entry (RKE) System Operation
The Remote Keyless Entry (RKE) transmitter functions work up to 60m(195 ft) away
from the vehicle.
There are other conditions which can affect the performance of the transmitter.
See Remote Keyle ...
Finding a Station
AM Source Shown, Other Sources Similar
If viewing a map screen, press the source screen (AM, FM, XM (if equipped), CD,
etc.) button. The display splits between the audio screen and the map screen ...
Danger, Warnings, and Cautions
Warning messages found on vehicle labels and in this manual describe hazards
and what to do to avoid or reduce them.
Danger indicates a hazard with a high level of risk which will result in
serio ...