Maps
This section includes basic information that you need to know about the map database.
The maps are stored on a compact flash drive that is built into the navigation system.
See also:
Total Weight on the Vehicle's Tires
Be sure the vehicle's tires are inflated to the inflation pressures found on
the Certification label on the driver door or see Vehicle Load Limits
for more information. Make sure n ...
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 v ...
How to Check
Use a good quality pocket-type gauge to check tire pressure. Proper tire inflation
cannot be determined by looking at the tire. Check the tire inflation pressure when
the tires are cold meaning th ...