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"CHK" message(s) are displayed on the SIGNAL CHECK screen. [12/2019 - 10/2022]: Procedure

  1. CHECK DISPLAY CHECK MODE 
    1. Check which items display on the signal check screen.
      GTY750364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Result Proceed to
      "CAMERA SW" displays "CHK" (red) A
      "CAN" displays "CHK" (red) B
      "SHIFT" displays "CHK" (red) C

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM 

    for Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022]

    for HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 10/2022]

    Result: 

    C 

    See step  4

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (PANORAMIC VIEW MONITOR SWITCH (FRONT WIDE VIEW SWITCH) - PARKING ASSIST ECU AND BODY GROUND) 
    1. Disconnect the H35 panoramic view monitor switch (front wide view switch) connector.
    2. Disconnect the H20 parking assist ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H20-15 (BLSW) - H35-5 (D) Always Below 1 Ω
      H35-2 (E) - Body ground Always Below 1 Ω
      H20-15 (BLSW) or H35-5 (D) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT PANORAMIC VIEW MONITOR SWITCH (FRONT WIDE VIEW SWITCH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

    REPLACE PANORAMIC VIEW MONITOR SWITCH (FRONT WIDE VIEW SWITCH). Refer to  REMOVAL [12/2019 - ] 

  4. CHECK BACK-UP LIGHT 
    1. Check that the back-up light comes on.

      OK

      The back-up light comes on.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO LIGHTING SYSTEM (EXT) 

    w/o AFS Function: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023]

    w/ AFS Function: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023]

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL) 
    1. Disconnect the H20 parking assist ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H20-14 (REV) - Body ground Ignition switch ON, shift lever in R 11 to 14 V
      H20-14 (REV) - Body ground Ignition switch ON, shift lever not in R Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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