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 
, and an" width=19
height=17 id="_x0000_i1807" src="images/books/1183/10/index.2.gif" border=0>, and an
Advisor can run a check.
See also:
Starting the Engine
Place the transmission in the
proper gear.
If the vehicle has the keyless
access system, the keyless access
transmitter must be authenticated in
order for the ignition control knob
to turn. ...
Magnetic Ride Control
With this feature on the CTS-V,
the Magnetic Ride Control system
adjusts the ride of the vehicle to
Tour or Sport modes. Magnetic Ride
Control monitors the suspension
system to determine the ...
Compass Messages
CAL
This message is displayed when the compass needs to be calibrated.
See Compass.
Three dashes will be displayed if the compass needs service. See your dealer
for service. ...