Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 20ql9 dsc40001

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                                                                                                                           05-1403
                                              DIAGNOSTICS       -   REAR SEAT AUDIO SYSTEM


REAR SEAT AUDIO SYSTEM
                                                                                                                                  05BUE-03


DESCRIPTION
1.      OUTLINE OF AVC-LAN
(a)     What is AVC-LAN?
        AVC-LAN is the abbreviation, which stands for Audio Visual Communication-Local Area Network.
        This is a unified standard co-developed by 6 audio manufactures associated with Toyota Motor Corpo-
        ration.
        The Unified standard covers signals, such as audio signal, visual signal, signal for switch indication
        and communication signal.
                                                                                    Stereo Component
      Example:                                                                      Amplifier Assy




                          Multi-display (CRT display)                             Multi-display Controller
       Gateway ECU        Display                                                 Sub-assy                       Navigation ECU




                                                        Radio Receiver Assy                             : AVC-LAN
                                                                                                                                    I34376



(b)     Objectives
        Recently the car audio system has been rapidly developed and functions have been changed drasti-
        cally. The conventional system has been switched to the multi-media type such as a navigation sys-
        tem. At the same time the level of customers needs to audio system has been upgraded. This lies be-
        hind this standardization.
        The concrete objectives are explained below.
        (1) When products by different manufactures were combined together, malfunctions used to occur
               such as sound failure. This problem can be solved by standardization of signals.
        (2) Various types of after market products have been able to add or replace freely.
        (3) Because of the above (2), each manufacture has become able to concentrate on developing
               products in their strongest field. This has enabled many types of products provided inexpensive-
               ly.
        (4) In general, a new product developed by one particular manufacture could not be used due to
               a lack of compatibility with other manufactures products. By developing this new standard, users
               can enjoy many compatible products from different manufacture anytime they want.
(c)     The above descriptions are the objectives to introduce AVC-LAN. By this standardization, develop-
        ment of new products no longer cause systematic errors.
HINT:
S       When +B short or GND short is detected in AVC-LAN circuit, communication stops, and audio system
        does not function normally.
S       When audio system is not equipped with a navigation system, audio head unit is the master unit. When
        audio system is equipped with a navigation system, radio receiver is the master unit.
S       The master unit is equipped with a resistor (60 to 80 ) for communication.
S       The car audio system using AVC-LAN circuit has a diagnosis function.

 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                              Author :                  Date :                    1586
05-1404
                                        DIAGNOSTICS   -   REAR SEAT AUDIO SYSTEM

S     Each product has its own specified numbers called physical address (three-digit number). Numbers
      are also allotted to each function in one product, which are called logical address (two-digit number).
2.    COMMUNICATION SYSTEM
(a)   This system performs communication between the radio receiver assy and stereo component control-
      ler assy through the AVC-LAN.

                       Stereo Component
                                                                  Radio Receiver Assy
                       Controller Assy
                                                AVC-LAN




                                                                                                        I34379



HINT:
Refer to "TOYOTA NAVIGATION SYSTEM" (See page 05-1379 ) or "AUDIO SYSTEM" (See page 05-1222 )
for the Main AVC-LAN circuit.
3.    DIAGNOSIS FUNCTION
(a) The radio receiver assy functions as a master unit in the AVC-LAN circuit on this system. It identifies
      the trouble in this circuit, and the identified information is displayed on the radio receiver assy.
HINT:
When performing the diagnosis check, refer to "TOYOTA NAVIGATION SYSTEM" (See page 05-1275 ) or
"AUDIO SYSTEM" (See page 05-1 192).




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                Author :            Date :              1587

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