Description And Operation: Navigation
DESCRIPTION
The navigation system includes the following major components:
| 1. | Refer to BODY CONTROL MODULE (BCM) . |
| 2. | Refer to RADIO RECEIVER MODULE (RRM) . |
| 3. | Refer to COMBINATION ANTENNA . |
The RRM 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 RRM 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 RRM 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 RRM 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 RRM 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 RRM 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 RRM 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 RRM. 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 RRM 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 RRM. The VR recognizes and responds to certain global commands, while other commands are specific to the RRM 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 RRM over the CAN-IHS data bus; however, the RRM is not a CAN gateway. All electronic message outputs of the navigation module and the RRM are carried over the CAN-IHS data bus. When the RRM 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 RRM.
| Refer to COMPONENT INDEX . |
Inputs:
- Transmission reverse gear status
- Vehicle speed signal
- Vehicle speed fault status
- Wheel speed sensor fault status
Outputs:
- Wheel speed sensor fault status
- Vehicle speed signal
- Vehicle speed fault status
- Transmission reverse gear status
| Refer to COMPONENT INDEX . |
A combination antenna with removable short mast is the standard antenna used on this vehicle. For models equipped with a Global Telematics Box Module (TBM2), the antenna is mounted in the same location but is a sharkfin antenna.
The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges and other frequencies - FM2/DAB radio frequencies received.
The combination antenna consists of a Global Positioning System (GPS) element, AM/FM element and a Long Term Evolution 1 (LTE1) element.
| Refer to COMPONENT INDEX . |
Inputs:
- RRM Mode status
- Dead reckoning information
- GPS data
- GPS antenna fail information
- Touchscreen input request
- Outputs from BCM
- Distance unit
Outputs:
- Short distances unit data
- Navigation vocal instructions
- Navigation visual instructions information
The hardwired circuits between components related to the RRM and the navigation system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, and connector repair procedures, refer to STANDARD PROCEDURE or REMOVAL or INSTALLATION .
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the RRM 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 RRM 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.
The navigation system components cannot be adjusted or repaired. If any of the navigation system components is damaged or ineffective, that component must be replaced. The external combination antenna can be repaired separately from the RRM. The navigation system software as well as the map data is flash programmable through the Universal Serial Bus (USB) port.