Navigation System (w/ DVD Player)

NAVIGATION: NAVIGATION SYSTEM (w/ DVD Player): SYSTEM DIAGRAM

NAVIGATION: NAVIGATION SYSTEM (w/ DVD Player): SYSTEM DESCRIPTION

1. NAVIGATION SYSTEM OUTLINE

(a) 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.

HINT
*: GPS (Global Positioning System)

HINT
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 decline.

(b) 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 receiver assembly.

(1) Gyro sensor

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

(2) Vehicle speed sensor

Used to calculate the vehicle running distance.

(c) GPS navigation (satellite navigation)

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

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

(d) 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.

2. NAVIGATION RECEIVER ASSEMBLY OUTLINE

(a) Conventionally, 2 separate devices, a "radio and display" and a "navigation ECU" are used. This model combines these devices into a signal unit.

3. TOUCH SCREEN OUT LINE

(a) 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.

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

(a) The navigation receiver assembly (built-in 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.

NOTICE:
* Do not disassemble any part of the navigation receiver assembly (built-in navigation ECU).
* Do not apply oil to the navigation receiver assembly (built-in navigation ECU).
* Do not insert anything but a DVD into the navigation receiver assembly (built-in navigation ECU).
5. DISC PLAYER OUTLINE

(a) A disc player uses a laser pickup to read digital signals recorded on discs. By converting the digital signals to analog, music and other content can be played.

CAUTION:
Do not look directly at the laser pickup because the disc player uses an invisible laser beam. Be sure to operate the player only as instructed.

NOTICE:
* Do not disassemble any part of the disc player.
* Do not apply oil to the disc player.
* Do not insert anything but a disc into the disc player.
(b) Usable discs

(1) Disc player

This player can only play audio CDs, CD-Rs (CD-Recordable), CD-RWs (CD-Re Writable), DVD videos, and video CDs that have any of the following marks:

(c) Precautions for handling disc

NOTICE:
* Copy-controlled CDs may not be used.
* Some discs are not playable as a result of: 1) the type of recording method used, 2) the type of disc, 3) scratches, 4) contamination, or 5) the disc being in the vehicle for an extended amount of time, leading to deterioration.
* Discs that have not been finalized cannot be played.
* PAL or SECAM color television standard discs cannot be played (only NTSC discs can be played).
* DualDiscs that mate DVD recorded material on one side with CD digital audio material on the other cannot be played.
* When handling a disc, be careful not to put fingerprints, stains or scratches on the disc.
* When holding a disc, pinch the center hole and edge of the disc with your fingers. Face the printed side upward.
* If a disc is ejected by pressing the eject button and left partially ejected for an extended period of time, the disc may become deformed and unusable.
* A disc may not be able to be ejected or the player may become damaged if: 1) cellophane tape, stickers, disc labels or rental disc labels are attached; or 2) residue from removed tape, stickers or labels remains.
* Avoid direct sunlight when storing discs as they may become deformed and unusable.
* Do not use uniquely-shaped discs as they may damage the player.
* Do not use discs where part of the recording surface is transparent or translucent. if used, the disc may become unable to be inserted, ejected and played.
HINT
* Just as condensation fogs the vehicle windows during wet or cold weather, condensation may also form inside the player. If condensation forms, disc skipping or playback stoppage may occur. Ventilate or dehumidify the vehicle for a while before using the player.
* If the player vibrates severely due to driving on a rough road, the disc may skip.
(d) Cleaning

NOTICE:
Do not use lens cleaner when cleaning the player, as it may damage the pickup part of the player.

(1) To clean dirty discs, use a dry, soft cloth such as those used for glasses with plastic lenses.

(2) Lightly wipe radially from the center of the disc.

NOTICE:
* Pressing the disc roughly with your hand or scrubbing with a hard cloth may scratch the disc surface.
* Using record spray, antistatic agents, alcohol, benzene, thinner or other solvents, and chemical cloths on a disc will damage the disc and may make the disc unusable.
6. MP3/WMA OUTLINE

(a) Playable MP3 file standards

(b) Playable WMA file standards

(c) ID3 tag and WMA tag

(1) Additional textual information called ID3 tag can be input to MP3 files. Information such as song titles and artist names can be stored.

HINT
This player is compatible with the ID3 tags of ID3 Ver. 1.0 and 1.1, and ID3 Ver. 2.2 and 2.3. (Number of characters complies with ID3 Ver. 1.0 and 1.1.)

(2) Additional textual information called WMA tag can be input to WMA files. Information such as song titles and artist names can be stored.

(d) Usable media

(1) Only CD-ROMs, CD-Rs (CD-Recordable), and CD-RWs (CD-ReWritable) can be used to play MP3/WMA files.

NOTICE:
* CD-Rs and CD-RWs are more easily affected by a hot and humid environment than discs used for normal audio CDs. For this reason, some CD-Rs and CD-RWs may not be played.
* If there are fingerprints or scratches on the disc, the disc may not be played or the CD may skip.
* Some CD-Rs and CD-RWs deteriorate if they are left in the cabin for a long time.
* Keep CD-Rs and CD-RWs in a storage case that is impenetrable to light.
(e) Usable media format

(1) Usable media format

HINT
* As for MP3/WMA files written in any format other than those above, the contents of the files may not be played normally or the file names or folder names may not be displayed correctly.
* This player is compatible with multi-session discs and can play CD-Rs and CD-RWs on which MP3/WMA files are added. However, only the first session can be played.
* Discs whose first session includes both music data and MP3 or WMA format data cannot be played.
(2) Standard and restrictions

(f) File names

(1) Only files with an extension of ".mp3" or ".wma" can be recognized and played as MP3 or WMA files.

(2) Save MP3 or WMA files with an extension of ".mp3" or ".wma".

NOTICE:
If saving non-MP3 or non-WMA files with an extension of ".mp3" or ".wma", those files are wrongly recognized as MP3 or WMA files and played. A loud noise may occur and damage to the speaker may result.

7. "BLUETOOTH" OUTLINE

(a) "Bluetooth" is a trademark owned by Bluetooth SIG, Inc.

(b) "Bluetooth" is a new wireless connection technology that uses the 2.4 GHz frequency band.

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

(c) Handsfree function

(1) The "Bluetooth" built into the navigation receiver assembly and a "Bluetooth" compatible cellular phone* can be connected using a "Bluetooth" wireless connection. This enables use of the handsfree function on the cellular phone even though the phone may be in a pocket or bag. For this reason, it is not necessary to use a connector or cable to connect the cellular phone.

* *: Some versions of "Bluetooth" compatible cellular phones may not function.

8. RADIO DESCRIPTION

(a) Radio frequency band

(1) Radio broadcasts use the radio frequency bands shown in the table below.

(b) Service area

(1) The service areas of AM and FM broadcasts are vastly different. Sometimes an AM broadcast can be received very clearly but an FM stereo cannot. FM stereo has the smallest service area, and is prone to pick up static and other types of interference such as noise.

(c) Radio reception problems

HINT
In addition to static, other problems such as "phasing", "multipath", and "fade out" exist. These problems are not caused by electrical noise, but by the radio signal propagation method itself.

(1) Phasing

AM broadcasts are susceptible to electrical interference and another kind of interference called phasing. Occurring only at night, phasing is the interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off the ionosphere and the other signal is received directly from the transmitter.

(2) Multipath

Multipath is a type of interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off buildings or mountains and the other signal is received directly from the transmitter.

(3) Fade out

Fade out is caused by objects (buildings, mountains, and other such large obstacles) that deflect away part of a signal, resulting in a weaker signal when the object is between the transmitter and vehicle. High frequency radio waves, such as FM broadcasts, are easily deflected by obstructions. Low frequency radio waves, such as AM broadcasts, are much more difficult to deflect.

(d) Noise problem

Technicians must have a clear understanding about each customer's noise complaint. Use the following table to diagnose noise problems.

HINT
If the noise does not match the examples above, refer to the descriptions about phasing and multipath.

9. AUTOMATIC SOUND LEVELIZER (ASL) FUNCTION OUTLINE

(a) The ASL function automatically adjusts the sound volume in order to enable clear audio quality even when vehicle noise increases (as vehicle speed increases, the volume is turned up, etc.).

Vehicle speed signals are received from the combination meter assembly and used for ASL control.

10. AVC-LAN DESCRIPTION

(a) 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.

(b) 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.

HINT
* If a short to +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.
11. COMMUNICATION SYSTEM OUTLINE

(a) Components of the navigation system communicate with each other via the AVC-LAN.

(b) The navigation receiver assembly has enough resistance (60 to 80 Ohms) necessary for transmitting communication signals. This is essential for communication.

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

12. DIAGNOSTIC FUNCTION OUTLINE

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

13. DIAGNOSIS DISPLAY DETAILED DESCRIPTION

HINT
* This section contains a detailed description of displays within diagnostic mode.
* Illustrations may differ from the actual vehicle screen depending on the device settings and options. Therefore, some detailed areas may not be exactly the same as on the actual vehicle screen.
(a) Service Menu Screen

HINT
Some items may be grayed out or not displayed based on the device settings.

(b) Failure Diagnosis Screen

HINT
Some items may be grayed out or not displayed based on the device settings.

(1) System Check Mode Screen

* *1: Device Name List No. 1

HINT
* Device Name List No. 1 displays some of the devices that make up the navigation system.
* The names of the components from Device Name List No. 1 are shown in the following table.

* *2: Check Result

HINT
Result codes for all devices are displayed.

* *3: Memory Clear

HINT
* Present and past DTCs and registered connected device names are cleared.
* Data is cleared by pressing the "Memory CLR" switch for 3 seconds.
* *4: Recheck

HINT
* A system check will be performed again after the memory is cleared.
* The Recheck switch will dim during a system check.
* *5: Device Name List No. 2

HINT
* Device Name List No. 2 displays some of the devices that make up the navigation system.
* The names of the components from Device Name List No. 2 are shown in the following table.

(2) Unit Check Mode Screen

HINT
Some items may be grayed out or not displayed based on the device settings.

(1) Microphone&Voice Recognition Check Screen

HINT
* The microphone is active at all times when this screen is displayed.
* While recording or playing, switches other than the stop switch cannot be pushed.
* When no recording is present, the play switch cannot be pushed.
* Recording will stop after 5 seconds or when the stop switch is pushed.
(2) GPS Information Screen

* *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

* *3: Measurement information

* *4: Position information

* *5: Date information

(3) Vehicle Sensors Screen

HINT
The signals from the vehicle sensors are updated once per second and if any have changed, the screen is updated.

(4) Vehicle Signal Check Mode Screen

HINT
* Only items sending vehicle signals will be displayed.
* The input signals from the vehicle are updated once per second and if any have changed, the screen is updated.