Description And Operation: Navigation: Notes
DESCRIPTION
The navigation system includes the following major components:
| 1. | Refer to BODY CONTROL MODULE (BCM) . |
| 2. | Refer to RADIO . |
| 3. | Refer to COMBINATION ANTENNA . |
The Radio is located within the instrument panel and is the primary component of the hands free phone system in this vehicle. Depending upon selected vehicle optional equipment the radio may include a microcontroller, a Bluetooth® transceiver, a navigation module, flash memory and sophisticated Advanced Speech Recognition (ASR) input capability through Voice Recognition (VR) software. The ASR software includes many different available languages. Each vehicle is equipped with a list of available languages, which are made available from the factory based upon languages most commonly used for the market destination. Refer to MODULE, RADIO RECEIVER, DESCRIPTION AND OPERATION .
A factory-installed satellite navigation system based upon the Global Positioning System (GPS) is an available option on this vehicle. A color touchscreen electronic display in the radio provides a graphical interface for programming, searching for and selecting destinations. In vehicles also equipped with a Uconnect® Hands Free telecommunication option, the available navigation systems are also equipped with ASR input capability allowing hands free operation.
This navigation system provides visual guidance through dynamic maps, while voice prompts through the audio system of the vehicle provide the vehicle operator with audible alerts and directions coordinated with the visual displays. The system also displays and logs valuable trip information such as speed, posted speed limit, distance and Estimated Time of Arrival (ETA).
The radio also contains a microcontroller and programming that allows it to communicate with other electronic modules in the vehicle using the Controller Area Network - Interior High Speed (CAN-IHS) data bus. Refer to COMMUNICATION, DESCRIPTION AND OPERATION .
OPERATION
The optional navigation system is active whenever the radio electronic display is powered ON. If a navigation system menu or map is not being actively displayed, the system is still operating in the background. The menu, map or route that was active when the radio was powered OFF along with all other user-relevant information is saved in nonvolatile memory by the navigation module for display again the next time the radio is powered ON and the navigation system is selected.
Once a destination is selected, the navigation system uses information from stored map data to quickly calculate a route. As the vehicle is driven along that route, the vehicle operator is guided with visual displays and voice prompts. Any variances from that route will cause the navigation system to automatically recalculate and deliver a revised route to the chosen destination.
All vehicles have their original map and Points-Of-Interest (POI) data stored in nonvolatile flash memory integral to the navigation module integral and internal to the radio. Updated map and POI data as well as updated navigation software for these vehicles can be uploaded to the system using USB media. The originally installed data is based upon the market for which the vehicle was manufactured. Navigation software updates are also uploaded to the system using USB media.
The GPS receiver of the navigation module is capable of acquiring and tracking GPS signal inputs through the roof-mounted combination antenna from numerous satellites simultaneously to calculate and display the position and direction of the vehicle. However, when access to satellite signals is blocked by bridges, tunnels or other obstacles, the navigation module relies upon Dead Reckoning (DR) to aid in calculating vehicle position and direction. The navigation module uses pulse signals from the wheel speed sensors, a Reverse gear indicator input and an internal electronic gyroscope sensor to provide DR vehicle position and direction calculations to supplement GPS satellite signals.
User input mechanisms for the navigation system include the radio touchscreen and the Uconnect® Hands Free VR verbal commands. The VR function uses ASR software. Master control of the VR function is handled by the VR engine internal and integral to the radio. The VR recognizes and responds to certain global commands, while other commands are specific to the radio or the navigation system.
For safety reasons some input, editing and setting features of the navigation system are restricted when the vehicle is in motion or when a hands free phone call is active. This includes many features that require touchscreen inputs. However, many of those same features disabled for touchscreen inputs remain enabled for Uconnect® Hands Free VR inputs.
The navigation module receives electronic message inputs within the radio over the CAN-IHS data bus; however, the radio is not a CAN gateway. All electronic message outputs of the navigation module and the radio are carried over the CAN-IHS data bus. When the radio monitors a problem in any of the audio system circuits and components, or in any of the navigation system antenna circuits, it stores a fault code or Diagnostic Trouble Code (DTC) in its memory circuit. The external combination antenna may be diagnosed separately from the radio.