PRE-COLLISION SYSTEM, Diagnostic DTC:U023A

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

DESCRIPTION

The millimeter wave radar sensor assembly communicates with the forward recognition camera via CAN communication. If there is a communication error with the forward recognition camera, the millimeter wave radar sensor assembly stores DTC U023A.

DTC No. Detection Item DTC Detection Condition Trouble Area
U023A Lost Communication With Image Processing Module "A" When the engine switch is on (IG), a communication error between the forward recognition camera and millimeter wave radar sensor assembly is detected for approximately 2 seconds.

  • CAN communication system

  • Forward recognition camera power source circuit

  • Forward recognition camera

  • Wire harness or connector

WIRING DIAGRAM

B006YCGE02
*a from IG1-NO. 1 Relay
*b ECU-IG1 NO. 3
*c Forward Recognition Camera
*d Millimeter Wave Radar Sensor Assembly

CAUTION / NOTICE / HINT

Note


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

  • Before measuring the resistance of the CAN bus, turn the engine 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

    Click here

  • 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 with a new one, be sure to perform forward recognition camera adjustment.

    Click here

Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. READ VALUE USING GTS (CAN BUS CHECK)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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


      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 DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

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


      1. Turn the engine switch on (IG) and wait 2 seconds or more.

    3. Check for DTCs.


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC U1002 is not output A
      DTC U1002 is output B

    B

    GO TO DTC CHART (U1002) Click here

    A

  3. CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - FORWARD RECOGNITION CAMERA)


    1. Disconnect the V6 forward recognition camera connector.

    2. Disconnect the A30 millimeter wave radar sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V6-6 (CANH) - A30-5 (CA1P) Cable disconnected from negative (-) battery terminal Below 1 Ω
      V6-12 (CANL) - A30-6 (CA1N) Cable disconnected from negative (-) battery terminal Below 1 Ω

    4. Connect the A30 millimeter wave radar sensor assembly connector.

    5. Connect the V6 forward recognition camera connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BUS LINE OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - FORWARD RECOGNITION CAMERA)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)


    1. B0070BEC64
      *a

      Front view of wire harness connector

      (to Forward Recognition Camera)

      Disconnect the V6 forward recognition camera connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V6-10 (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
      V6-7 (IGB) - Body ground Engine switch on (IG) 11 to 14 V

    5. Connect the V6 forward recognition camera connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FORWARD RECOGNITION CAMERA Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)