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DTC U023A: Lost Communication with Front Camera Module [10/2015 - ]: Procedure

  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - ]

    2. Perform the following procedure.

      HINT: 

      If the following procedure is not performed, the previously output DTC cannot be detected.

      1. Turn the engine switch on (IG) and wait 1 second or more.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - ]

      Result

      Result Proceed to
      DTC U1002 is not output A
      DTC U1002 is output B

    Result: 

    B 

    GO TO DTC CHART (U1002). Refer to  DTC U1002: Lost Communication with Gateway Module [10/2015 - ]  

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS WIRE (FORWARD RECOGNITION CAMERA) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the forward recognition camera connector.
      GTY524061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Forward Recognition Camera)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Y17-6 (CANH) - Y17-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO FORWARD RECOGNITION CAMERA (CANH, CANL) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (FORWARD RECOGNITION CAMERA - BATTERY AND BODY GROUND) 
    1. Disconnect the forward recognition camera connector.
      GTY527797Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Forward Recognition Camera)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Y17-10 (GND) - Body ground Always Below 1 Ω
    3. Connect the cable to the negative (-) battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Y17-7 (IGB) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [10/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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