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:
Rear Vision Camera Error
Messages
SERVICE REAR VISION CAMERA
SYSTEM: This message can
display when the system is not
receiving information it requires from
other vehicle systems.
If any other problem occurs or if a
problem ...
Rear Window Defogger
(Rear Window Defogger):
Press to turn the rear window
defogger on or off.
The rear window defogger turns
off automatically after about
10 minutes. If turned on again it
runs for about five ...
Electric Parking Brake Light
The Electric Parking Brake (EPB) light should come on briefly as the engine is
started. If it does not come on, have the vehicle serviced by your dealer.
The parking brake status light comes on w ...