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:
Footnotes — Maintenance
Schedule Additional Required
Services — Normal
a) Vehicles with different size front
and rear tires do not have tire
rotation. See Tire Rotation.
b) Or every two years, whichever
comes first. More frequent
replacement may be needed if the ...
If No Steam Is Coming from the Engine Compartment
If an engine overheat warning is displayed but no steam can be seen or
heard, the problem may not be too serious. Sometimes the engine can get a
little too hot when the vehicle:
- Climbs a long h ...
Shoulder Belt Height Adjuster
The vehicle has a shoulder belt height adjuster for the driver and right
front passenger seating positions.
Adjust the height so that the shoulder portion of the belt is on the
shoulder and not f ...