DYNAMIC RADAR CRUISE CONTROL 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 and driving support ECU transmit the data for general vehicle control and the diagnosis function through the communication line.

The millimeter wave radar sensor assembly transmits information about the vehicle in front to the driving support ECU.

DTC Code DTC Detection Condition Trouble Area
U0235 While the vehicle speed is 50 km/h (31 mph) or more with the cruise control switch on, a communication stop between the millimeter wave radar sensor and driving support ECU continues for 1 second or more.

  • Harness or connector

  • Millimeter wave radar sensor assembly

  • Driving support ECU

WIRING DIAGRAM

A01XEX9E02

CAUTION / NOTICE / HINT

Note


  • When the driving support ECU is replaced with a new one, initialization must be performed Click here.

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

  • Confirm that the connector is securely connected, as a partially connected connector may be the cause of this DTC.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR)

    Note

    A DTC is stored when the following inspection is performed. Be sure to clear the DTC after performing this inspection.


    1. Disconnect the G119 ECU connector.

    2. A01XIEJE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU)
      *b

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the A15 sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G119-30 (B) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A15-5 (IGB) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU AND MILLIMETER WAVE RADAR SENSOR - BODY GROUND)


    1. Disconnect the A15 sensor connector.

    2. A01XDUUE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU)
      *b

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the G119 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G119-25 (GND) - Body ground Always Below 1 Ω
      A15-2 (SGND) - Body ground Always Below 1 Ω

    NG

    REPAIR HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR)


    1. Disconnect the G119 ECU connector.

    2. Disconnect the A15 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G119-18 (CA1N) - A15-3 (CA1N) Always Below 1 Ω
      G119-40 (CA1P) - A15-4 (CA1P) Always Below 1 Ω
      G119-18 (CA1N) or A15-3 (CA1N) - Body ground Always 10 kΩ or higher
      G119-40 (CA1P) or A15-4 (CA1P) - Body ground Always 10 kΩ or higher

    NG

    REPAIR HARNESS OR CONNECTOR

    OK

  4. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly Click here.


    NEXT

  5. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Adjust the millimeter wave radar sensor assembly Click here.


    NEXT

  6. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Perform the following to make sure the DTC detection conditions are met.

      Tech Tips

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


      1. Drive the vehicle at a speed of 50 km/h (31 mph) or more.

      2. Turn the cruise control switch on.

    3. Check for DTCs Click here.

      OK
      DTC U0235 is not output.

    OK

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE DRIVING SUPPORT ECU Click here