Navigation System
The vehicle navigation system provides a feature that will guide the user to a pre-entered destination. The system uses the Global Positioning Sensor (GPS), vehicle speed, and other sensor information to accurately establish vehicle position. The navigation system module (NSM) sends information to the navigation system display module (NSDM) and compares this position to the CD-ROM vector map. The system then instructs the user of the maneuvers required during the journey in order to arrive at the destination entered.
The major components of the vehicle navigation system are:
- Global Positioning Sensor (GPS) antenna
- Navigation system display module (NSDM)
- Navigation system module (NSM)
- Navigation system console harness
- Navigation system compact disc (CD)
- Navigation GPS antenna cable in instrument panel
The GPS antenna is used to initially find the global location. The system tracks different satellites simultaneously, when available, in order to calculate the position. The GPS only receives data and does not communicate back to the satellites.
The navigation system consists of the following components:
- Navigation system module (NSM) (located in the center floor console storage bin)
- Navigation system display module (NSDM) (located in the center floor console)
- Navigation system antenna - Global Positioning Sensor (GPS) (located under the instrument panel relay panel)
- Navigation system compact disc (CD) (located in the navigation system module)
A gyroscopic device along with vehicle speed input from the powertrain control module (PCM) is used to improve the accuracy of the navigation system. The gyroscope monitors the turning forces created when the vehicle is cornering and detects changes in direction. A reverse input from the rear electronic module (REM), is also required by the NSM to indicate direction.
The NSM will only function with the ignition switch is in the RUN or ACC position. The NSM utilizes internal self-test diagnostics, and is not compatible with a scan tool.