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 assembly 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 assembly. The driving support ECU assembly sends this information to the power management control ECU and performs cruise control.

DTC No. DTC Detection Condition Trouble Area
U0235 When the power switch is on (IG), a communication error from the millimeter wave radar sensor to the driving support ECU assembly is detected for approx. 2 seconds.

  • Millimeter wave radar sensor

  • Driving support ECU assembly

  • Wire harness or connector

WIRING DIAGRAM

A005BA9E01
*a from IG1 NO. 1 Relay
*b ECU-IG NO. 2
*c Millimeter Wave Radar Sensor
*d Driving Support ECU Assembly

CAUTION / NOTICE / HINT

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 (MILLIMETER WAVE RADAR SENSOR - DRIVING SUPPORT ECU ASSEMBLY)


    1. Disconnect the L60 driving support ECU assembly connector.

    2. Disconnect the A2 millimeter wave radar sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A2-3 (LRDD) - L60-16 (LRDD) Always Below 1 Ω
      A2-3 (LRDD) - Body ground Always 10 kΩ or higher
      A2-4 (LRRD) - L60-38 (LRRD) Always Below 1 Ω
      A2-4 (LRRD) - Body ground Always 10 kΩ or higher
      A2-2 (SGND) - Body ground Always Below 1 Ω
      L60-25 (GND) - Body ground Always Below 1 Ω

    NG

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

    OK

  2. CHECK DRIVING SUPPORT ECU ASSEMBLY (B CIRCUIT)


    1. Turn the power switch on (IG).

    2. A005F1PE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L60-30 (B) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (B CIRCUIT)

    OK

  3. CHECK MILLIMETER WAVE RADAR SENSOR (IGB CIRCUIT)


    1. Turn the power switch on (IG).

    2. A005F0VE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A2-5 (IGB) - Body ground Power switch on (IG) 11 to 14 V

    3. Reconnect the A2 millimeter wave radar sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGB CIRCUIT)

    OK

  4. CHECK DRIVING SUPPORT ECU ASSEMBLY (LRDD OUTPUT VOLTAGE)


    1. Turn the power switch on (IG).

    2. A005BW5E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L60-16 (LRDD) - Body ground Power switch on (IG) 4.5 to 5.5 V

    NG

    REPLACE MILLIMETER WAVE RADAR SENSOR Click here

    OK

  5. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU assembly Click here.


    NEXT

  6. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Turn the cruise control main switch on.

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

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

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR Click here