GM Service Manual Online
For 1990-2009 cars only

Coverage areas within the United States vary with respect to the level of map detail available for any given area. Some areas will feature greater levels of detail than others. If this happens, it does not mean there is a problem with the system. As regional map CDs are updated, more detail may become available for areas which previously had limited detail. See "Ordering Regional Map Compact Discs" previously in this section.