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:
Removing the Spare Tire and
Tools (Sedan)
Sedan
A. Wing Nut
B. Spare Tire
C. Jack
D. Wheel Wrench
E. Extension (If Equipped)
F. Strap
To access the spare tire and jacking
equipment:
1. Remove the spare tire cover.
2. Remove the f ...
Drive Systems
All-Wheel Drive
Vehicles with this feature always send engine power to all four wheels. It
is fully automatic, and adjusts itself as needed for road conditions.
When using a compact spare tire ...
Removing the Flat Tire and Installing the Spare Tire
Take off the wheel cover or center cap, if the vehicle has one, to reach the
wheel bolts.
1. Do a safety check before proceeding. See If a Tire Goes Flat for more
information.
2. Turn the wheel ...