2008 Cadillac XLR Owner's Manual - Page 258

Keyless Access System When the engine is started, Driver 1 or Driver 2 will display on the screen. A message will not appear on the screen if the driver is unknown. The number on the back of the transmitter corresponds to driver 1 or driver 2. The navigation system can store memory points for drivers 1 and 2 individually. See Keyless Access System on page 2-5 for more information. The GPS shows the 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 on page 4-44. This system may not be available or interferences may occur if any of the following are true: • Signals are obstructed by tall buildings, trees, large trucks, or a tunnel. OnStar® System When using the OnStar® system, the audio system will be muted and the navigation voice prompts will be disabled during the call. The volume of the OnStar® call can be adjusted by using the steering wheel volume controls. See OnStar® System on page 2-41 for more information. • Objects are located on the rear shelf. • Satellites are being repaired or improved. • After-market glass tinting has been applied to the vehicle's rear windshield. Notice: Do not apply after-market glass tinting to the vehicle's windows. Glass tinting will interfere with the system's ability to receive GPS signals and cause the system to malfunction. You might have to replace the window to correct the problem. This would not be covered by your warranty. For more information if you are experiencing a problem, see If the System Needs Service on page 4-52 and Problems with Route Guidance on page 4-52. Global Positioning System (GPS) 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. 4-50