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:
Using Cruise Control on Hills
How well the cruise control works on hills depends on the vehicle speed, the
load, and the steepness of the hills. When going up steep hills, pressing the accelerator
pedal may be necessary to mai ...
Express Window Anti-Pinch Override
WARNING
If express override is activated, the window will not reverse automatically.
You or others could be injured and the window could be damaged. Before you use express
override, make sur ...
Compass
Your vehicle may have a compass in the Driver Information Center (DIC).
Compass Zone
The zone is set to zone eight upon leaving the factory. Your dealer will set
the correct zone for your location ...