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Home >> Lexus >> 2016 >> GX 460 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Multi-Terrain Monitor System (Diagnostics - Introduction) >> Multi-Terrain Monitor System >> System Description [08/2019 - 08/2021] >> System Description [08/2019 - 08/2021]

System Description [08/2019 - 08/2021]

  1. OPERATION EXPLANATION 
    1. The reverse position signal is sent from the shift lever position switch to the parking assist ECU when the shift lever is moved to R.
    2. An appropriate steering angle and timing information can be provided for the driver. This is based on the information from the steering angle sensor signal and the vehicle angle data signal that are sent to the parking assist ECU.

      HINT: 

      The steering sensor signal is used to control parking assist only for estimated guide line mode.

  2. COMMUNICATION SYSTEM OUTLINE 
    1. CAN communication system
      1. The multi-terrain monitor system uses CAN communication for data communications between the parking assist ECU and each ECU.
      2. If a problem occurs in the CAN communication line, the parking assist ECU outputs a CAN communication malfunction DTC. (To check, use the Techstream.)

        Refer to DTC CHECK / CLEAR [08/2019 - 08/2021] 

      3. If a problem occurs in the CAN communication line, the parking assist ECU outputs a CAN communication malfunction DTC. (To check, use the multi-display assembly diagnosis screen.)

        Refer to DIAGNOSIS SYSTEM [08/2019 - 08/2021] 

      4. If a CAN communication line malfunction DTC is output, repair the malfunction in the communication line and troubleshoot the multi-terrain monitor system when data communication is normal.
      5. Since the CAN communication line has its own length and route, it cannot be repaired temporarily with a bypass wire, etc.
    2. AVC-LAN communication system
      Fig 1: AVC-LAN Communication System
      GTY958909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Components of the navigation system communicate with each other via the AVC-LAN.
      2. The AVC-LAN uses a twisted pair of wires for its communication lines.
      3. The master unit of the AVC-LAN is the multi-media module receiver assembly.

        HINT: 

        • The multi-media module receiver assembly has the resistance (60 to 80 Ω) necessary for communication.
        • If a short or open circuit occurs in the AVC-LAN circuit, communication is interrupted and the system will not operate normally.
  3. VIDEO SIGNALS 
    1. Video signal circuit
      Fig 2: Video Signal Circuit
      GTY958986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Video signals from the front television camera assembly are input into the parking assist ECU via analog communication lines (vehicle wire harness).
      2. Video signals from the side television camera assembly LH are input into the parking assist ECU via analog communication lines (vehicle wire harness).
      3. Video signals from the side television camera assembly RH are input into the parking assist ECU via analog communication lines (vehicle wire harness).
      4. Video signals from the rear television camera assembly are input into the parking assist ECU via analog communication lines (vehicle wire harness).
      5. Video signals from the parking assist ECU are input into the multi-display assembly via GVIF cable.
    2. Screen display
      1. Video signals input from each camera are processed in the parking assist ECU and displayed on the multi-display assembly as the multi-terrain monitor system screen.
  4. DIAGNOSTIC FUNCTION OUTLINE 
    1. This multi-terrain monitor system has a diagnostic function displayed in the multi-display assembly. This function enables the calibration (adjustment and verification) of the multi-terrain monitor system.

      Refer to DIAGNOSIS SYSTEM [08/2019 - 08/2021] 

    2. The multi-terrain monitor system can check the following items by using the Techstream.
      Item Proceed to
      DTC Refer to DTC CHECK / CLEAR [08/2019 - 08/2021] 
      Data List / Active Test Refer to DATA LIST / ACTIVE TEST [08/2019 - 08/2021] 
  5. CALIBRATION 
    1. Use the multi-terrain monitor system diagnosis screen for calibration and checking of the multi-terrain monitor system.

      Refer to DIAGNOSIS SYSTEM [08/2019 - 08/2021] 

      NOTE:

      Part replacement and work performed during servicing may require calibration of the multi-terrain monitor system and other systems.

      Refer to CALIBRATION [08/2019 - 08/2021] 

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