PRE-COLLISION SYSTEM, Diagnostic DTC:U0235

DTC Code DTC Name
U0235 Lost Communication with Cruise Control Front Distance Range Sensor

DESCRIPTION

The millimeter wave radar sensor assembly is connected to the skid control ECU (brake actuator assembly) by a CAN communication line.

When entering test mode, the skid control ECU (brake actuator assembly) communicates with the millimeter wave radar sensor assembly and determines whether the vehicle is equipped with a pre-collision system.

U023A is output when it is determined that the vehicle is not equipped with a pre-collision system.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0235 Lost Communication with Cruise Control Front Distance Range Sensor When entering test mode, the skid control ECU (brake actuator assembly) determines that the vehicle is not equipped with a pre-collision system

  • Skid control ECU (Brake actuator assembly)

  • Millimeter wave radar sensor assembly

  • Wire harness or connector

CAUTION / NOTICE / HINT

Note


  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one.

  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here

  • The pre-collision system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC U0235 and other DTCs are output A
      Only DTC U0235 is output B

    A

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    B

  2. CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Trouble Codes
      Result
      Result Proceed to
      Vehicle stability control system DTC are not output A
      Vehicle stability control system DTC are output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  3. TEST MODE INSPECTION (VEHICLE STABILITY CONTROL SYSTEM)

    Tech Tips

    When entering test mode, the skid control ECU (brake actuator assembly) communicates with the millimeter wave radar sensor assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit test mode within 5 seconds of entering test mode.


    1. Procedure to Enter Test Mode (Signal Check)


      1. Turn the ignition switch to ON.

      2. for Manual Transmission:

        Check that the shift lever is in neutral and apply the parking brake.

        for Automatic Transmission:

        Check that the shift lever is in P and apply the parking brake.

      3. Put the steering wheel in the neutral position.

      4. Connect the GTS to the DLC3.

      5. Turn the ignition switch to ON.

      6. Turn the GTS on.

      7. Switch the skid control ECU (brake actuator assembly) to Test Mode (Signal Check) using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC/EPB / Utility / Signal Check.

        Tech Tips

        Do not exit test mode within 5 seconds of entering test mode. If test mode is exited within 5 seconds of entering test mode, DTC U0235 may be stored. If DTC U0235 is output after exiting test mode, enter test mode again, wait at least 5 seconds, then recheck for DTCs.


        Chassis > ABS/VSC/TRC/EPB > Utility
        Tester Display
        Signal Check

    2. Test Mode (Signal Check) Display Check


      1. Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.

        Tech Tips

        If the ABS warning and slip indicator lights remains illuminated or does not illuminate when Test Mode (Signal Check) is entered, a component or wire harness may be malfunctioning.

    3. End of Test Mode (Signal Check)


      1. Turn the ignition switch off and disconnect the GTS.

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

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

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC U0235 is not output A
      DTC U0235 is output B

    A

    END

    B

  5. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly.

      Click here

    2. Adjust the millimeter wave radar sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

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

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC U0235 is not output A
      DTC U0235 is output B

    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

  7. REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)


    1. Replace the skid control ECU (brake actuator assembly).


      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

    END (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) WAS DEFECTIVE)