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DTC U023A: Lost Communication with Front Camera Module [09/2017 - 05/2019]: Procedure

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

      Refer to DTC CHECK / CLEAR [09/2017 - 05/2019]

      Body Electrical > Pre-Collision 2 > Clear DTCs 

    2. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [09/2017 - 05/2019]

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      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 [09/2017 - 05/2019]  

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS MAIN LINES (FORWARD RECOGNITION CAMERA) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the T17 forward recognition camera connector.
      GTY779486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of 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
      T17-6 (CANH) - T17-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
    4. Connect the T17 forward recognition camera connector.
    5. Connect the cable to the negative (-) battery terminal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the T17 forward recognition camera connector.
      GTY779488Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of 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
      T17-10 (GND) - Body ground Always Below 1 Ω
    4. Connect the cable to the negative (-) battery terminal.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      T17-7 (IGB) - Body ground Engine switch on (IG) 11 to 14 V
    6. Connect the T17 forward recognition camera connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [09/2017 - 05/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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