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CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU), Diagnostic DTC:U023A

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DTC Code DTC Name
U023A Lost Communication with Front Camera Module
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DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
U023A No communication from the forward recognition camera continues.

  • Forward recognition camera branch line or connector

  • Power source circuit of forward recognition camera

  • Forward recognition camera ground circuit

  • Forward recognition camera
Tip:

This diagnosis procedure is for when "Front Camera Module" is displayed on the CAN Bus Check screen and DTC U023A is output by the driving support ECU assembly (GTS display: Pre-Crash 2).

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output (Click here).

  • After performing repairs, perform the procedure listed in DTC Reproduction Method and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG) and wait at least 3 seconds.

  • After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).

Tip:

  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

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PROCEDURE


  1. Click here

    RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tip:

      If DTC U1002 is output from Pre-Crash 2 of the driving support ECU assembly, this indicates a sub bus 13 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 13.

      Result
      Result Proceed to

      U1002 is not output from driving support ECU assembly.

      (GTS display: Pre-Crash 2)

      		 A

      U1002 is output from driving support ECU assembly.

      (GTS display: Pre-Crash 2)

      		 B

  2. Click here

    CHECK FOR OPEN IN CAN BUS LINES (FORWAD RECOGNITION CAMERA BRANCH LINE)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. A0006KGE02

      Disconnect the T12 forward recognition camera connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      T12-6 (CANH) - T12-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Forward Recognition Camera)

    • OKClick here
    • NG

      REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (FORWAD RECOGNITION CAMERA)

  3. Click here

    CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A000912E02

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      T12-11 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Forward Recognition Camera)

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

  4. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. Connect the cable to the negative (-) auxiliary battery terminal.

    2. A0006N2E02

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      T12-7 (IGB) - Body ground Power switch on (IG) 11 to 14 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Forward Recognition Camera)

    • OK

      REPLACE FORWARD RECOGNITION CAMERA (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)