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:
Front Fog Lamp Light
For vehicles with front fog lamps, this light comes on when the front fog lamps
are in use.
The light goes out when the front fog lamps are turned off. See Front Fog Lamps
for more inform ...
If the Off Indicator Is Lit for an Adult-Size Occupant
If a person of adult size is sitting in the front outboard passenger seat, but
the off indicator is lit, it could be because that person is not sitting properly
in the seat. Use the following st ...
When the System Does Not
Seem to Work Properly
The RVC system may not work
properly or display a clear image if:
• The RVC is turned off. See
“Turning the Rear Camera
System On or Off” earlier in this
section.
• It is dark.
• ...