Antenna, Navigation: Operation: Operation

The navigation module acquires Global Positioning System (GPS) position data through a navigation antenna module. Vehicles equipped with the optional satellite radio system have a roof-mounted combination antenna that also receives satellite audio and cellular signals. Refer to ANTENNA, SATELLITE, OPERATION . Vehicles not equipped with the optional satellite radio system have a dedicated navigation antenna module mounted near the top of the instrument panel below the windshield.

The navigation antenna module is used to provide satellite information for route calculation and vehicle positioning purposes to the navigation unit (also known as the Telematics Gateway Module/TGW), which is integral to the Radio Receiver Module (RRM) (also known as the radio or the head unit). The antenna modules receive time pulse information from the GPS satellites, then calculate and transmit altitude, latitude, longitude, number of satellites, satellite direction, satellite angle of elevation, direction, signal to noise ratio and accuracy information.

The hard wired circuits between components related to the navigation antenna module may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the navigation antenna module or the electronic controls and communication between modules and other devices that provide some features of the navigation system. The most reliable, efficient and accurate means to diagnose the navigation antenna module or the electronic controls and communication related to navigation system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.