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Audio System: Pre-Check

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. DIAGNOSIS CHECK 
    1. Starting Diagnosis Mode (All elements are lighting in the SW check mode).
      1. Turn off the audio system and turn the IG switch to ACC. While pressing the preset switches "1" and "6" at the same time, press "DISC" 3 times.
      2. Reference:
        • When the system enters the Diagnosis Mode, a "beep" tone is emitted 3 times and all the elements are lighting in the SW check mode.
        • It takes about 40 seconds to complete the check.
        • Turn all the elements in the LCD on.
        • When pressing the switch, confirm a beep tone is emitted.
        • Press the "SEEK TRACK UP" button to enter the "Service Check Screen".
      Fig 1: Starting Diagnosis Mode
      G02630088Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Service Check Screen.
      1. Reference:

        In the service check mode, the system check and the diagnosis memory check are performed, and the check results are displayed in ascending order of the device codes (physical address.)

      TERMS MEANING

      Terms Meaning
      Component code (Physical address) Three-digit code (In hexadecimal) given to each device comprising AVC-LAN. Corresponding to its function, individual symbol is provided.
      Logical address Two-digit code (In hexadecimal) given to each function and device unit in each device comprising AVC-LAN.

      Code No. (physical address) List 

      CODE NO. (PHYSICAL ADDRESS) LIST

      Code No. (physical address) Equipment name
      190 Radio receiver assy (Audio head unit)
      440 Stereo component amplifier
      1F6, 16C Multi-display Controller Sub-assy
      1F4 Stereo Component Controller Assy
    3. Finishing Diagnosis Mode.
      1. Press "DISC" for 2 seconds or more, or turn the IG switch OFF.
    4. Service Check Mode Result Display (for checking the current and the past system conditions).
      1. Press the "SEEK TRACK" switch to see the check result of each device.
        Fig 2: Service Check Mode Result Display
        G02630089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Check Result Display.
        RESULT DISPLAY (1 OF 2)

        Display Original Language Meaning Action to be taken
        good Good (normal) No DTCs are detected in both "System Check Mode" and "Diagnosis Memory Mode". -
        NCON No connection The system recognized the component when it was registered, but the component gives no response to the "Diagnosis Mode ON Request". Check the power source circuit and the communication circuit of the device indicated by the device code (physical address).
        ECHN Exchange One or more DTC for "Exchange" is detected in either "System Check Mode" or "Diagnosis Memory Mode". Go to the detail information mode to check the trouble area referring to the DTC list.
        CHEC Check When no DTCs are detected for "Exchange", one or more DTC for "Check is detected in either "System Check Mode" or "Diagnosis Memory Mode". Go to the detail information mode to check the trouble area referring to the DTC list.
        RESULT DISPLAY (2 OF 2)

        Display Original Language Meaning Action to be taken
        OLD Old version Old DTC application is identified and DTC is detected in either "System Check Mode" or "Diagnosis Memory Mode". -
        NRES No response The device gives no response to any one of "System Check Mode ON Request", "System Check Result Request" and "Diagnosis Memory Request". Check the power source circuit and the communication circuit of the device indicated by the device code (physical code).
      3. To Perform the service check again, press the preset switch "1".
    5. Detailed information Mode (when displaying the troubled device's DTC)
      1. With "CHEC" or "ECHN" being displayed, press the preset switch "2" to go to the detailed information mode.
      2. Press the "SEEKTRACK" switch to display "System Check Result (SYS)" and "Diagnosis Memory Response (CODE)".
        Fig 3: Service Check & Detailed Information Mode Display
        G02630090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Displayed Items in Detailed Information Mode
        Fig 4: DTC Display Division Code Meaning Table
        G02630091Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check the trouble area referring to the DTC list.
      5. To return to the service check mode, press the preset switch "3".
    6. Clearing Individual DTC Memory (when clearing the memory of the DTC detected in the past individually)
      1. Press the preset switch "5" for 2 seconds or more while the "ECHN" is displayed in the service check mode or during the detailed information mode.

      HINT:

      • Beep sound is emitted once when the DTC memory is completely cleared.
      • When the DTC memory is cleared, only the component code (physical address) is displayed for the target component.
      • To check DTCs, press the preset switch "1" and Perform the service check again.
    7. Clearance of all the DTC memory (when clearing all the memory of the DTCs detected in the past)
      1. Start the diagnosis mode after repairing the trouble area.
      2. Press the preset switch "5" for 2 seconds or more. ("CLR" is displayed at this time.)

        HINT:

        • Beep sound is emitted once when the DTCs memory is completely cleared.
        • When the DTCs memory for all the device is cleared, only the component codes (physical address) are displayed.
      3. Press the preset switch "1" to Perform the service check again, and check that no DTCs are displayed for all the component codes (physical address).
  2. IDENTIFICATION OF NOISE SOURCE 
    1. Identify the condition under which the noise occurs, and check the noise filter on the related part.
      NOISE SOURCE IDENTIFICATION

      Condition in which noise occurs Noise Source
      Depressing the acceleration pedal increases noise, and stopping the engine erases the noise immediately. Generator
      Noise occurs during the A/C or the heater operation. Blower motor
      Rapid acceleration while driving on the unpaved road or after the IG switch is turned ON makes noise. Fuel pump
      Pressing and then releasing the horn switch, and keeping pressing the horn switch makes unusual noise. Horn
      Stopping the engine erases small noise that has been heard. Ignition
      Noise occurs synchronously with the turn signal flash. Flasher
      Noise occurs during the window washer operation. Washer
      Noise occurs during the engine running, and it continues after the engine stops. Engine coolant temperature sensor
      Noise occurs during the wiper operation. Wiper
      Noise occurs when the brake pedal is depressed. Stop light switch
      Others. Static electricity stored on the vehicle
    2. Reference:
      • Make sure first that there is no noise from outside. Failing to do so makes the noise source detection difficult and leads to misunderstanding.
      • The noise should be removed in descending order of loudness.
      • Setting the radio untuned makes noise noticeable, making the recognition of the phenomenon easier.
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