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:
Turn Signals when Towing a
Trailer
The turn signal indicators on the
instrument panel flash whenever
signaling a turn or lane change.
Properly hooked up, the trailer
lamps also flash, telling other
drivers the vehicle is turni ...
Chemical Paint Spotting
Airborne pollutants can fall upon and attack painted vehicle surfaces causing
blotchy, ring-shaped discolorations, and small, irregular dark spots etched into
the paint surface. ...
Vehicle Settings
See Vehicle Personalization for more information. ...