GM Service Manual Online
For 1990-2009 cars only

Inappropriate route guidance can occur under one or more of the following conditions:

    • You have not turned onto the road indicated.
    • Route guidance might not be available when using automatic rerouting for the next right or left turn.
    • The route might not be changed when using automatic rerouting.
    • There is no route guidance when turning at an intersection.
    • Plural names of places are occasionally announced.
    • It may take a long time to operate automatic rerouting during high-speed driving.
    • Automatic rerouting can display a route returning to the set waypoint if heading for a destination without passing through a set waypoint.
    • The route prohibits the entry of a vehicle due to a regulation by time or season or any other regulation which is given.
    • Some routes are not searched.
    • The route to the destination might not be shown if there are new roads, if roads have recently changed or if certain roads are not listed on the map DVD. See Ordering Map DVDs.

To recalibrate the vehicle's position on the map, see "Navigation Setup" under Navigation Menu to calibrate the system.