PRE-COLLISION SYSTEM, Diagnostic DTC:U0235

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

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area
U0235 Lost Communication with Cruise Control Front Distance Range Sensor When the power switch is on (IG), a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.

  • Millimeter wave radar sensor assembly CAN branch line or connector

  • Millimeter wave radar sensor assembly power source circuit.

  • Millimeter wave radar sensor assembly

WIRING DIAGRAM

B004BI1E01

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

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

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Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECUs and sensors to communicate using the CAN communication system. 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 connectors of ECUs or wire harnesses while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

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      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.

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      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

  2. CHECK FOR OPEN IN CAN BUS MAIN LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)


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

    2. B004B10C29
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the F1 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
      F1-5 (CA1P) - F1-6 (CA1N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    4. Connect the F1 millimeter wave radar sensor assembly connector.

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

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)


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

    2. B004B10C30
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the F1 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
      F1-1 (SGND) - Body ground Always Below 1 Ω

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F1-8 (IGB) - Body ground Power switch on (IG) 11 to 14 V

    6. Connect the F1 millimeter wave radar sensor assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)