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:
Replacing LATCH System Parts After a Crash
WARNING!
A crash can damage the LATCH
system in the vehicle. A damaged
LATCH system may not properly
secure the child restraint,
resulting in serious injury or even
death in a crash. To hel ...
3-D Lane Guidance
Some major metropolitan areas may include a 3-D lane guidance feature for highway
exits and junctions. This feature gives you an enhanced representation of the exits
and junctions on the route. ...
Gasoline Specifications (U.S. and Canada Only)
At a minimum, gasoline should meet ASTM specification D 4814 in the United
States or CAN/CGSB—3.5 or 3.511 in Canada. Some gasolines contain an
octane-enhancing additive called methylcyclopentadieny ...