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 Advisor can run a check.
See also:
How the System Works
When the vehicle is started, both
outside mirror displays will briefly
come on to indicate that the system
is operating. While driving forward,
the left or right side mirror SBZA
display w ...
SERVICE PARK BRAKE
For vehicles with the electric parking
brake, this message displays if a
problem is detected with the electric
parking brake system. See your
dealer for service. ...
Using this Manual
To quickly locate information about
the vehicle, use the Index in
the back of the manual. It is an
alphabetical list of what is in the
manual and the page number
where it can be found. ...