CAN COMMUNICATION SYSTEM(for RHD), Diagnostic DTC:U023A

DTC Code DTC Name
U023A Lost Communication with Front Camera Module

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U023A Lost Communication with Front Camera Module There is no communication from the lane departure warning camera.

  • Power source circuit of lane departure warning camera

  • Lane departure warning camera ground circuit

  • Lane departure warning camera CAN branch wire or connector

  • Lane departure warning camera

 Hybrid vehicle control ECU

For vehicles with a lane departure alert system.

WIRING DIAGRAM

A0001OOE06
*1 No. 4 CAN Junction Connector
*2 ECU-IG NO.1
*3 from IG1 NO.1 Relay
*4 Lane Departure Warning Camera

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.

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  • 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.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG) and wait at least 52 seconds, and then drive the vehicle at a speed of 1 km/h (1 mph) or more for 7 seconds or more.

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

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  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • When replacing the lane departure warning camera, make sure to replace it with a new one.

Tech Tips


  • 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.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Check for DTCs.


      Body Electrical > HV Gateway > Trouble Codes

      Tech Tips

      If DTC U1002 is output from the gateway of the hybrid vehicle control ECU, this indicates a sub bus 11 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 11.

      Result
      Result Proceed to
      U1002 is not output from hybrid vehicle control ECU A
      U1002 is output from hybrid vehicle control ECU B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (LANE DEPARTURE WARNING CAMERA BRANCH WIRE)


    1. A00029CC05
      *a

      Front view of wire harness connector

      (to Lane Departure Warning Camera)

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

    2. Disconnect the lane departure warning camera connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T10-6 (CA1P) - T10-12 (CA1N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (LANE DEPARTURE WARNING CAMERA)

    OK

  3. CHECK HARNESS AND CONNECTOR (LANE DEPARTURE WARNING CAMERA - BATTERY AND BODY GROUND)


    1. A00029CC06
      *a

      Front view of wire harness connector

      (to Lane Departure Warning Camera)

      Reconnect the cable to the negative (-) auxiliary battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T10-7 (IGB) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T10-11 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LANE DEPARTURE WARNING CAMERA Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR