NAVIGATION SYSTEM SYSTEM DESCRIPTION


  1. NAVIGATION SYSTEM OUTLINE


    1. Vehicle position tracking methods


      1. It is essential that the navigation system correctly tracks the current vehicle position and displays it on the map. There are 2 methods to track the current vehicle position: autonomous (dead reckoning) and GPS* (satellite) navigation. Both navigation methods are used in conjunction with each other.

        Tech Tips

        *: GPS (Global Positioning System)

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        Operation Description
        Vehicle Position Calculation The navigation ECU calculates the current vehicle position (direction and current position) using the direction deviation signal from the gyro sensor and running distance signal from the vehicle speed sensor and creates the driving route.
        Map Display Processing The navigation ECU processes the vehicle position data, vehicle running track, and map data from the map disc.
        Map Matching The map data from the map disc is compared to the vehicle position and running track data. Then, the vehicle position is matched with the nearest road.
        GPS Correction The vehicle position is matched to the position measured by the GPS. Then, the measurement position data from the GPS unit is compared with the vehicle position and running track data. If the position is very different, the GPS measurement position is used.
        Distance Correction The running distance signal from the vehicle speed sensor includes error caused by tire wear and slippage between the tires and road surface. Distance correction is performed to account for this. The navigation ECU automatically offsets the running distance signal to make up for the difference between the distance signal and the distance data of the map. The offset is automatically updated.

        Tech Tips

        The combination of autonomous and GPS navigation makes it possible to display the vehicle position even when the vehicle is in places where the GPS radio wave cannot be received. When only autonomous navigation is used, the mapping accuracy may slightly decrease.

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    2. Autonomous navigation

      This method determines the relative vehicle position based on the running track determined by the gyro and vehicle speed sensors located in the navigation ECU.


      1. Gyro sensor

        Calculates the direction by detecting angular velocity. It is located in the navigation ECU.

      2. Vehicle speed sensor

        Used to calculate the vehicle running distance.

    3. GPS navigation (satellite navigation)

      This method detects the absolute vehicle position using radio waves from GPS satellites*.

      Tech Tips

      *: GPS satellites were launched by the U.S. Department of Defense for military purposes.

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      Number of Satellite Measurement Description
      2 or less Measurement impossible The vehicle position cannot be obtained because the number of satellites is not enough.
      3 2-dimensional measurement is possible The vehicle position is obtained based on current longitude and latitude (this is less precise than 3-dimensional measurement).
      4 3-dimensional measurement is possible The vehicle position is obtained based on current longitude, latitude and altitude.

    4. Map matching

      The current driving route is calculated by autonomous navigation (according to the gyro sensor and vehicle speed sensor) and GPS navigation. This information is then compared with possible road shapes from the map data in the map disc and the vehicle position is set onto the most appropriate road.

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  2. MULTI-DISPLAY OUTLINE


    1. Touch switch

      Touch switches are touch-sensitive (interactive) switches operated by touching the screen. When a switch is pressed, the outer glass bends to contact the inner glass at the pressed position. By doing this, the voltage ratio is measured and the pressed position is detected.

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  3. DVD (Digital Versatile Disc) PLAYER OUTLINE (for Navigation Map)


    1. The navigation ECU uses a laser pickup to read the digital signals recorded on a DVD.

      CAUTION:

      Because the navigation system uses an invisible laser beam, do not look directly at the laser pickup. Be sure to only operate the navigation as instructed.

      Note


      • Do not disassemble any part of the navigation ECU.

      • Do not apply oil to the navigation ECU.

      • Do not insert anything but a DVD into the navigation ECU.

  4. DVD (Digital Versatile Disc) PLAYER OUTLINE (for DVD Changer Models)


    1. The DVD player can only play DVD videos that have any of the following marks:

      A01636Y

      1. Precaution for use of discs

        Note


        • PAL or SECAM color television standard discs cannot be played (only NTSC discs can be played).

        • Keep the discs away from dirt. Be careful not to damage the discs or leave fingerprints on them.

        • Hold discs by the outer edge and center hole with the label side up.

        • Leaving the disc exposed halfway out of the slot for a long time after pressing the disc eject button may cause deformation of the disc, making the disc unusable.

        • Do not use odd-shaped CDs because these may cause player malfunctions.

        • Do not use discs whose recording portion is transparent or translucent because they may not be inserted, ejected, or played normally.

        • DualDiscs that mate DVD recorded material on one side with CD digital audio material on the other cannot be played.

  5. "BLUETOOTH" OUTLINE


    1. "Bluetooth" is a trademark owned by Bluetooth SIG, Inc.

    2. "Bluetooth" is a new wireless connection technology that uses the 2.4 GHz frequency band. This makes it possible to connect a cellular phone ("Bluetooth" capable phone*) to the multi-display ("Bluetooth" system is built-in) through the handsfree function of the cellular phone, even if it is in a pocket or bag. As a result, it is not necessary to use a connector for the cellular phone.

      Tech Tips

      *: The communication performance of "Bluetooth" may vary depending on the "Bluetooth" version, obstructions or radio wave conditions between communication devices, electromagnetic radiation, communication device sensitivity, or antenna capacity.

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  6. RDS-TMC function outline


    1. This system has a function which allows the reception of traffic information from RDS-TMC (Radio Data System Traffic Message Channel) stations based on FM-multiple broadcasting. It assists the driver to avoid areas with traffic congestion. It also helps to improve traffic flow and road safety.

    2. The radio receiver receives RDS-TMC signals and then transmits these signals to the multi-display (built-in navigation ECU).

  7. AVC-LAN DESCRIPTION


    1. What is AVC-LAN?

      AVC-LAN, an abbreviation for "Audio Visual Communication Local Area Network", is a united standard developed by manufacturers in affiliation with Toyota Motor Corporation. This standard pertains to audio and visual signals as well as switch and communication signals.

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    2. Purpose:

      Recently, car audio systems have rapidly developed and the functions have vastly changed. The conventional car audio system is being integrated with multimedia interfaces similar to those in navigation systems. At the same time, customers are demanding higher quality from their audio systems. This is merely an overview of the standardization background. The specific purposes are as follows:


      1. To solve sound problems, etc. caused by using components of different manufacturers through signal standardization.

      2. To allow each manufacturer to concentrate on developing products they do best. From this, reasonably priced products can be produced.

        Tech Tips


        • If a short +B or short to ground is detected in the AVC-LAN circuit, communication is interrupted and the navigation system will stop functioning.

        • The multi-display unit acts as the master unit.

  8. COMMUNICATION SYSTEM OUTLINE


    1. Components of the navigation system communicate with each other via the AVC-LAN.

    2. The radio receiver assembly has enough resistance (60 to 80 Ω) necessary for transmitting communication signals. This is essential for communication.

    3. If a short circuit or open circuit occurs in the AVC-LAN circuit, communication is interrupted and the navigation system will stop functioning.

  9. DIAGNOSTIC FUNCTION OUTLINE


    1. The navigation system has a diagnostic function (the result is indicated on the master unit).

    2. Each component has a specified number (3-digit) called a physical address. Each function has a number (2-digit) called a logical address.

    3. A 3-digit hexadecimal component code (physical address) is allocated to each component on the AVC-LAN. Using this code, the component in the diagnostic function can be displayed.

  10. DIAGNOSIS DISPLAY DETAILED DESCRIPTION

    Tech Tips


    • This section contains a detailed description of displays within diagnostic mode.

    • Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore, some detailed areas may not be exactly the same as on the actual vehicle.


    1. SYSTEM CHECK


      1. System Check Mode Screen

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        • *1: Device Names and Hardware Address

          Tech Tips


          • Registered device names are displayed.

          • If a device name is unknown to the system, its physical address is shown instead.

            Address No. Name Address No. Name
            110 EMV 120 AVX
            128 1DIN TV 140 AVN
            144 G-BOOK 178 NAVI
            17C MONET 190 AUDIO H/U
            1AC CAMERA-C 1B0 Rr-TV
            1C0 Rr-CONT 19D BT-HF
            1C4 PANEL 1C6 G/W
            1C8 FM-M-LCD 1D8 CONT-SW
            1EC Body 118 EMVN
            1F1 XM 1F2 SIRIUS
            230 TV-TUNER 240 CD-CH2
            250 DVD-CH 280 CAMERA
            360 CD-CH1 3A0 MD-CH
            17D TEL 440 DSP-AMP
            530 ETC 1F6 RSE
            1A0 DVD-P 1D6 CLOCK
            238 DTV 480 AMP

        • *2: Check Result

          Tech Tips

          Result codes for all devices are displayed.

          Result Meaning Action
          OK Device did not respond with DTC (excluding communication DTCs from AVC-LAN). -
          EXCH Device responds with "replace" type DTC. Check for DTC in "Unit Check Mode" and replace device.
          CHEK Device responds with "check" type DTC. Check for DTC in "Unit Check Mode".
          NCON Device was previously present, but does not respond in diagnostic mode.

          - Check power supply wire harness of device.

          - Check AVC-LAN of device.
          Old Device responds with "old" type DTC. Check for DTC in "Unit Check Mode".
          NRES Device responds in diagnostic mode, but gives no DTC information.

          - Check power supply wire harness of device.

          - Check AVC-LAN of device.

        • *3: Code Clear


          • Present DTCs are cleared.

          • Press the "Code CLR" switch for 3 seconds.


        • *4: Memory Clear


          • Present and past DTCs and registered connected device names are cleared.

          • Press the "Memory CLR" switch for 3 seconds.

      2. Diagnosis MENU Screen

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        Tech Tips

        Some items may be grayed out or not displayed, as the functions are different depending on the vehicle.

      3. Unit Check Mode Screen

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        Screen Description
        Display Content
        *1: Device name Target device
        *2: Segment Target device logical address
        *3: DTC DTC (Diagnostic Trouble Code)
        *4: Timestamp Time and date of past DTCs are displayed (year is displayed in 2-digit format).
        *5: Present Code DTCs output at service check are displayed.
        *6: Past Code Diagnostic memory results and stored DTCs are displayed.
        *7: Diagnosis Clear Switch Pushing this switch for 3 seconds clears diagnostic memory data of target device (responses to diagnostic system check result and displayed data are cleared).

      4. LAN Monitor (Original) Screen

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        • *: Check Result

          Tech Tips

          Check results of all the devices are displayed.

          Result Meaning Action
          No Err (OK) There are no communication DTCs. -
          CHEK Device responds with "check" type DTC. Check for DTC in "Unit Check Mode".
          NCON Device was previously present, but does not respond in diagnostic mode.

          1. Check power supply wire harness of device.

          2. Check AVC-LAN of device.
          Old Device responds with "old" type DTC. Check for DTC in "Unit Check Mode".
          NRES Device responds in diagnostic mode, but gives no DTC information.

          1. Check power supply wire harness of device.

          2. Check AVC-LAN of device.

      5. LAN Monitor (Individual) Screen

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        Screen Description
        Display Content
        *1: Device name Target device
        *2: Segment Target logical address
        *3: DTC DTC (Diagnostic Trouble Code)
        *4: Sub-code (device address) Physical address stored with DTC (if there is no address, nothing is displayed).
        *5: Connection check No. Connection check number stored with DTC
        *6: DTC occurrence Number of times same DTC has been stored
        *7: Diagnosis Clear Switch Pushing this switch for 3 seconds clears diagnostic memory data of target device (responses to diagnostic system check result and displayed data are cleared).

    2. DISPLAY CHECK


      1. Vehicle Signal Check Mode Screen

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        Screen Description
        Name Content
        Battery Battery voltage is displayed.
        PKB Parking brake ON/OFF state is displayed.
        REV Reverse signal ON/OFF state is displayed.
        IG Engine switch ON/OFF state is displayed.
        ADIM/TCAN Brightness state DIM (with) / BRIGHT (without) is displayed.
        TAIL TAIL signal (Light control switch) ON/OFF state is displayed.
        SPEED Vehicle speed is displayed in km/h.

        Tech Tips


        • Only items sending a vehicle signal will be displayed.

        • This screen is updated once per second when input signals to the vehicle are changed.

      2. Microphone & Voice Recognition Check Screen

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        Screen Description
        Name Content
        *1: Microphone input level meter Monitors the microphone input level every 100 ms and displays the results in 8 different levels.
        *2: Recording switch Starts recording.
        *3: Stop switch Stops recording.
        *4: Play switch Plays the recorded voice.
        *5: Recording indicator Comes on while recording.

        Tech Tips


        • The microphone input function is on at all times when this screen is displayed.

        • While recording or playing, the switches other than the stop switch cannot be pushed.

        • When no voice is recorded, the play switch cannot be pushed.

        • Recording will stop after 5 seconds or by pushing the stop switch.

    3. NAVIGATION CHECK


      1. Navigation Check Screen

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        Tech Tips

        Some items may be grayed out or not displayed, as the functions are different depending on the vehicle.

      2. GPS Information Screen

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        • *1: Satellite information

          Information from a maximum of 12 satellites is displayed on the screen. This information includes the target GPS satellite number, elevation angle, direction, and signal level.


        • *2: Receiving condition

          DENSO Model
          Display Content
          T System is receiving GPS signal, but is not using the signal for location.
          P System is using GPS signal for location.
          - System cannot receive GPS signal.
          AISIN AW Model
          Display Content
          01H System cannot receive a GPS signal.
          02H System is tracing a satellite.
          03H System is receiving a GPS signal, but is not using the signal for location.
          04H System is using the GPS signal for location.

        • *3: Measurement information

          Display Content
          2D 2-dimensional location method is being used.
          3D 3-dimensional location method is being used.
          NG Location data cannot be used.
          Error Reception error has occurred.
          - Any other state.

        • *4: Position information

          Display Content
          Position Latitude and longitude information on current position is displayed.

        • *5: Date information

          Display Content
          Date Date/time information obtained from GPS signal is displayed in Greenwich Mean Time (GMT).

      3. Vehicle Sensors Screen

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        Vehicle Signal
        Display Content
        *1: REV REV signal ON/OFF state is displayed.
        *2: SPD SPD signal condition is displayed.
        Sensor Signal
        Display Content
        *3: Gyro sensor Gyro sensor output condition is displayed (when vehicle is driven straight or is stationary, voltage is approximately 2.5 V).

        Tech Tips

        Signals are updated once per second only when vehicle sensor signals are changed.

      4. MICROPHONE & VOICE RECOGNITION CHECK Screen

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        Screen Description
        Display Content
        *1: Microphone input level meter Monitors the microphone input level every 100 ms and displays the results in 8 different levels.
        *2: Recording switch Starts recording.
        *3: Stop switch Stops recording.
        *4: Play switch Plays the recorded voice.
        *5: Recording indicator Comes on while recording.

        Tech Tips


        • The microphone input function is on at all times when this screen is displayed.

        • While recording or playing, the switches other than the stop switch cannot be pushed.

        • When no voice is recorded, the play switch cannot be pushed.

        • Recording will stop after 5 seconds or by pushing the stop switch.

      5. RDS-TMC Information Screen

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        • *1: Frequency

          Display Content
          Frequency The latest received frequency, at which an RDS-TMC signal is detected, is displayed.

        • *2: Date of update

          Display Content
          Date The latest date and time of TMC signal detection are displayed. (Greenwich mean time)

        • *3: PI code

          Display Content
          PI code Broadcast station identification code (to identify the content of the program) is displayed.

        • *4: PS name

          Display Content
          PS name Broadcast station name is displayed.

        • *5: Provider name

          Display Content
          Provider The name of the TMC provider (TMC information source) is displayed (max. 8 characters).

        • *6: MGS

          Display Content
          MGS

          The latest radio reception area is displayed.

          The letter "N", "R", and/or "U" is displayed depending on the reception area.

        Tech Tips


        • If radio wave has never been received, "-" is displayed for all the items.

        • As for the MGS, "N" shows a domestic level, "R" shows a local level, and "U" shows a city level. If 2 or 3 levels are applicable, the letters are displayed in a line.

        • RDS-TMC information is not updated in DTC mode.

      6. DVD player information Screen

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        Screen Description
        Display Content
        *1: Trouble code Each code corresponding to malfunctions is displayed. For details, refer to Trouble Code Description.
        *2: Occurrence time

        • Date (year, month, day) and time (hour, minute, second) when trouble code was stored are displayed as time stamp (Greenwich mean time).

        • Time data to be displayed is received from GPS receiver.
        *3: Trouble code clear switch All code data being displayed is cleared by pushing this switch for 3 seconds.
        *4: Returning switch Previous page is displayed. If current displayed page is first page, this switch cannot be operated.
        *5: Proceeding switch Next page is displayed. If current displayed page is last page, this switch cannot be operated.
        Trouble Code Description
        Code Malfunction Countermeasure
        01 Cannot be recognized

        Replace navigation ECU Click here.
        03 Cannot be read

        Follow inspection procedure for DTC 58-42 Click here.

        Tech Tips

        There is a DVD player check function in the navigation ECU.