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DTC Check/Clear

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  1. DIAGNOSTIC CHECK 
    Fig 1: Identifying Radio Switches
    G04412707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Start diagnostic mode (All elements come on during SW check mode).
      1. Turn off the audio system and turn the ignition switch to the ACC position. While pressing the preset switches 1ch and 6ch at the same time, press the DISC switch 3 times.
      2. Reference:
        • When the system enters diagnostic mode, a beep sound is emitted 3 times and all the elements come on during SW check mode.
        • It takes approximately 40 seconds to complete the check.
        • Turn on all the elements in the LCD.
        • When pressing the switch, confirm that a beep sound is emitted.
    2. Service check screen.
      1. Press the SEEK TRACK UP switch to enter the service check screen.
      2. In service check mode, the system check and the diagnostic memory check are performed, and the check results are displayed by component codes in ascending order (physical address).
        TERMS DESCRIPTION

        Terms Description
        Component code (Physical address) Three-digit code (in hexadecimal) given to each device comprising AVC-LAN. Corresponding to its function, individual symbol 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 Equipment Name
        190 Radio receiver assembly (Audio head unit)
        440 Stereo component amplifier assembly
    3. Finish diagnostic mode.
      1. Press the DISC switch for 2 seconds or more, or turn the ignition switch off.
    4. Service check mode result display (for checking the current and the past system conditions).
      1. Press the SEEK TRACK UP/DOWN switch to see the check result of each component.
        Fig 2: Service Check Mode Result Display - Press SEEK TRACK UP/DOWN Switch
        G04412708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        The Fig 2 shows the case that the system has 2 components with the codes 190 and 360, and that one of them (code 360) requires a check.

        The check result is displayed by a component code in ascending order. The component device code is displayed first, and then the check result follows.

      2. Check the result display.
        RESULT DISPLAY REFERENCE

        Display Original Language Description Action to be Taken
        good Good (normal) No DTCs are detected in either system check mode nor diagnostic memory mode. -
        NCON No connection The system recognized the component when it was registered, but the component gives no response to the diagnostic mode ON request. Check the power source circuit and the communication circuit of the component indicated by the component code (physical address).
        ECHN Exchange One or more DTCs for Exchange are detected in either system check mode or diagnostic memory mode. Go to detailed information mode to check the trouble area, referring to the DTC list.
        CHEC Check When no DTCs are detected for Exchange, one or more DTCs for Check are detected in either system check mode or diagnostic memory mode. Go to detailed information mode to check the trouble area, referring to the DTC list.
        OLD Old version Old DTC application is identified and DTC is detected in either system check mode or diagnostic memory mode. -
        NRES No response The device gives no response to any one of system check mode ON request, system check result request or diagnostic memory request. Check the power source circuit and the communication circuit of the component indicated by the component code (physical address).
      3. To perform the service check again, press the preset switch 1 ch.
    5. Detailed information mode (when displaying the DTC for a troubled component)
      1. With CHEC or ECHN being displayed, press the preset switch 2ch to go to detailed information mode.
      2. Press the SEEK TRACK UP/DOWN switch to display the system check result (SYS) and diagnostic memory response (CODE).
        Fig 3: Service Check Mode Result Display - Information (1 Of 2)
        G04412709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 4: Service Check Mode Result Display - Information (2 Of 2)
        G04412710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        The Fig 3 shows the case that the component with the code 190 has DTC 47 and DC as a result of the system check and the diagnostic memory response.

        The detailed information mode shows the system check result first, then the diagnostic memory response result follows. (*2): As for the DTCs that do not have any sub codes, no sub code is displayed.

      3. Displayed items in detailed information mode
        INFORMATION MODE REFERENCE

        Division Code for DTC display Description The order of detailed information displayed when the TUNE UP switch is pressed. (The order is reversed when the TUNE DOWN switch is pressed.)
        SYS System check result is displayed. Logical address --> DTC
        CODE Diagnostic memory check result is displayed. Logical address --> DTC --> Sub code --> Connection confirmation number --> The number of times of occurrence
      4. Check the trouble area referring to the DTC list.
      5. To return to the service check mode, press the preset switch 3ch.
  2. DTC CLEAR 
    1. Clearing an individual DTC memory (when clearing the memory of the DTC detected in the past individually)
      1. Press the preset switch 5ch for 2 seconds or more while ECHN is displayed in service check mode or detailed information mode.

        HINT:

        • A 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 1ch and perform the service check again.
    2. Clearing all the DTC memories (when clearing all the memories of DTCs detected in the past)
      1. Start diagnostic mode after repairing the trouble area.
      2. Press the preset switch 5ch for 2 seconds or more (CLR is displayed at this time).

        HINT:

        • A beep sound is emitted once when the DTC memories are completely cleared.
        • When the DTC memories for all the components are cleared, only the component codes (physical address) are displayed.
      3. Press the preset switch 1ch to perform the service check again, and check that no DTCs are displayed for any component codes (physical address).
    3. Finish diagnostic mode
      1. Press DISC for 2 seconds or more, or turn the ignition switch off.
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