PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0235

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

DESCRIPTION

The driving support ECU sends information on steering angle and steering direction to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU. The driving support ECU sends this information to the ECM and performs cruise control.

DTC No. DTC Detection Condition Trouble Area
U0235 When the power switch is on (IG), a communication error between the millimeter wave radar sensor and the driving support ECU is detected for approx. 1 second.

  • Communication circuit

  • Millimeter wave radar sensor

  • Driving support ECU

WIRING DIAGRAM

A01NFNME12

INSPECTION PROCEDURE

Note


  • When replacing the millimeter wave radar sensor with a new one, make sure to perform Adjust Millimeter Wave Radar Sensor Assembly Click here.

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

PROCEDURE


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


    1. A01NDUDE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor)
      *2

      Front view of wire harness connector

      (to Driving Support ECU)

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

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

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

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


    NG

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

    OK

  2. CHECK MILLIMETER WAVE RADAR SENSOR (IGB VOLTAGE)


    1. A01NESXE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor)

      Disconnect the millimeter wave radar sensor connector.

    2. 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

    3. Reconnect the millimeter wave radar sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGB CIRCUIT)

    OK

  3. CHECK MILLIMETER WAVE RADAR SENSOR (SGND CIRCUIT)


    1. A01NESXE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor)

      Disconnect the millimeter wave radar sensor connector.

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

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

    3. Reconnect the millimeter wave radar sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SGND CIRCUIT)

    OK

  4. CHECK MILLIMETER WAVE RADAR SENSOR (LRDD OUTPUT VOLTAGE)


    1. A01NCOKE13
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Driving Support ECU)

      Disconnect the driving support ECU 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
      C1-16 (LRDD) - Body ground Power switch on (IG) 4.5 to 5.5 V

    4. Reconnect the driving support ECU connector.


    NG

    REPLACE MILLIMETER WAVE RADAR SENSOR Click here

    OK

  5. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU Click here.


    NEXT

  6. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Turn the cruise control main switch on.

    3. Drive the vehicle at the required speed (45 km/h (27 mph) or higher).

    4. Check if the same DTC is output Click here.

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

    B

    REPLACE DRIVING SUPPORT ECU Click here

    A

    END