GM Service Manual Online
For 1990-2009 cars only

The Navigation System determines the position of your vehicle by using satellite signals, various vehicle signals and map data from the map DVD.

The Global Positioning System (GPS) locates the current position of your vehicle using signals sent by the United States Department of Defense GPS satellites. GPS will appear green on the screen if the satellite signal is received. GPS will be gray if no signal is being received. See Symbols listed previously in this section for more information.

At times, other interferences such as the satellite condition, road configuration, the condition of the vehicle and/or other circumstances can interfere with the system's ability to determine the accurate position of the vehicle.

The system may not be available or interference may occur if any of the following are true:

    • Signals are obstructed by tall buildings, large trucks or a tunnel.
    • Metallic objects are located on the dashboard.
    • Satellites are being repaired or improved.
    • After-market glass tinting has been applied to the vehicle's windshield.

Notice: Aftermarket glass tinting with metallic material will interfere with the system's ability to receive GPS signals and cause the system to malfunction. You might have to replace the rear window to correct the problem. The repairs would not be covered by your warranty. Do not apply aftermarket glass tinting with metallic material to the rear window of your vehicle.

If you are experiencing a problem, see Vehicle Positioning and Problems with Route Guidance following for more information.

The navigation system determines the position of your vehicle by using satellite signals, various vehicle signals and map data.

At times, other interferences such as the satellite condition, road configuration, the condition of the vehicle and/or other circumstances can interfere with the navigation system's ability to determine the accurate position of the vehicle.

The GPS shows the accurate current position of your vehicle using signals sent by the GPS Satellites of the United States Department of Defense. When your vehicle is not receiving signals from the satellites, a symbol will appear on the map screen. Refer to Symbols .

This system may not be available/or interference may occur if the following happens:

    • Signal obstructions are caused by tall buildings, large trucks or tunnels,
    • objects are located on the rear shelf,
    • satellites are being repaired or improved and will not send signals,
    • after-market glass tinting has been applied to the vehicle's rear window.

Notice: Aftermarket glass tinting with metallic material will interfere with the system's ability to receive GPS signals and cause the system to malfunction. You might have to replace the rear window to correct the problem. The repairs would not be covered by your warranty. Do not apply aftermarket glass tinting with metallic material to the rear window of your vehicle.

For more information if you are experiencing a problem, see If the System Needs Service and Problems with Route Guidance .