LIGHTING SYSTEM, Diagnostic DTC:U023A

DTC Code DTC Name
U023A Lost Communication With Image Processing Module "A"

DESCRIPTION

The No. 1 headlight ECU sub-assembly LH communicates with the forward recognition camera via CAN communication. If communication between the No. 1 headlight ECU sub-assembly LH and forward recognition camera stops, the No. 1 headlight ECU sub-assembly LH will store this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U023A Lost Communication With Image Processing Module "A" The power switch is on (IG) and a communication malfunction between the No. 1 headlight ECU sub-assembly LH and forward recognition camera is detected for 10 seconds or more.

  • No. 1 headlight ECU sub-assembly LH

  • Forward recognition camera

  • CAN communication system

  • Harness or connector

 w/ Adaptive High Beam System

WIRING DIAGRAM

B006HYKE02

CAUTION / NOTICE / HINT

Note


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

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced or removed and installed, be sure to perform adjustment of the forward recognition camera.

    Click here

  • 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

  • If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (CAN BUS CHECK)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: System Select / Can Bus Check.

      Click here


      CAN Bus Check
      Result
      Result Proceed to
      All of the ECUs and sensors that are currently connected to the CAN communication system are displayed A
      None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes

      Tech Tips

      When pre-crash safety system DTC U1002 is output, check that the local bus is functioning normally by performing the diagnostic procedure for U1002.

      OK
      DTC U1002 is not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DTC U1002 Click here

    OK

  3. CHECK CAN BUS LINE

    B006HGIC35
    *a

    Front view of wire harness connector

    (to Forward Recognition Camera)

    1. Turn the power switch off.

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

    3. Disconnect the O6 forward recognition camera connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O6-6 (CANH) - O6-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Tech Tips

      If the result is not as specified, a malfunction in a CAN communication line is suspected.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CAN BUS LINE)

    OK

  4. CHECK HARNESS AND CONNECTOR (FORWARD RECOGNITION CAMERA - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O6-10 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT FORWARD RECOGNITION CAMERA (IGB TERMINAL VOLTAGE)

    B006J2TC05
    *a

    Front view of wire harness connector

    (to Forward Recognition Camera)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O6-7 (IGB) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Perform Forward Recognition Camera Learning.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / AHS / Trouble Codes.

    5. Clear the DTCs.


      Body Electrical > AHS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / AHS / Trouble Codes.

    5. Check for DTCs.


      Body Electrical > AHS > Trouble Codes
      OK
      DTC U023A is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    NG

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here