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 diagnosis function along the communication line. The millimeter wave radar sensor assembly transmits information about the vehicle in front to the driving support ECU.

DTC No. DTC Detection Condition Trouble Area
U0235 The ECM detects a communication error signal (from the millimeter wave radar sensor assembly to the driving support ECU) for 1 second or more while the dynamic radar cruise control is operating

  • Millimeter wave radar sensor assembly

  • Millimeter wave radar sensor circuit

  • Driving support ECU

WIRING DIAGRAM

A01NETUE02

INSPECTION PROCEDURE

Note

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.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY POWER SOURCE)


    1. A01NFXCE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the millimeter wave radar sensor assembly connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B1-5 (IGB) - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the millimeter wave radar sensor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - IG1 RELAY)

    OK

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


    1. A01NDUDE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)
      *2

      Front view of wire harness connector

      (to Driving Support ECU)

      Disconnect the driving support ECU and millimeter wave radar sensor assembly connectors.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C1-16 (LRDD) - B1-3 (LRDD) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C1-16 (LRDD) or B1-3 (LRDD) - Body ground Always 10 kΩ or higher

    3. Reconnect the driving support ECU and millimeter wave radar sensor assembly connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

    OK

  3. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)


    1. A01NFXCE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the millimeter wave radar sensor assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B1-2 (SGND) - Body ground Always Below 1 Ω

    3. Reconnect the millimeter wave radar sensor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)

    OK

  4. 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.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC U0235)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed of 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

      3. Push the -SET switch to activate the cruise control.

    5. Enter the following menus: Powertrain / Radar Cruise / DTC.

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC U0235 is output B

    B

    REPLACE DRIVING SUPPORT ECU Click here

    A

    END