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:
ELECTRONIC KEY ALREADY
KNOWN
If the vehicle has the keyless
access system, this message
displays if you try to match a
transmitter that has already been
learned. See the keyless access
information for Remote Keyless
E ...
Cruise Control
CTS Shown, CTS–V Similar
The cruise control buttons are
located on the left side of the
steering wheel.
: Press to turn the system on or
off. The indicator light on the button
turns on wh ...
Brakes
This vehicle has disc brakes.
Disc brake pads have built-in wear indicators that make a high-pitched
warning sound when the brake pads are worn and new pads are needed.
The sound can come and g ...