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DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U0235, U1104

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DTC Code DTC Name
U0235 Lost Communication with Cruise Control Front Distance Range Sensor
U1104 Lost Communication with Driving Support ECU
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DESCRIPTION

The driving support ECU assembly sends vehicle speed and vehicle condition information to the millimeter wave radar sensor assembly. The millimeter wave radar sensor assembly then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0235 Lost Communication with Cruise Control Front Distance Range Sensor While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the millimeter wave radar sensor assembly and driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

  • Harness or connector
U1104 Lost Communication with Driving Support ECU While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and millimeter wave radar sensor assembly is detected for approximately 0.2 seconds or more.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

  • Harness or connector
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU 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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PROCEDURE


  1. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

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      Result
      Result Proceed to
      CAN communication system DTCs are not output OK
      CAN communication system DTCs are output NG

  2. Click here

    CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BATTERY AND BODY GROUND)


    1. Disconnect the Q2 driving support ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Q2-7 (B) - Body ground Engine switch on (IG) 11 to 14 V
      Q2-7 (B) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      Q2-28 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. B00663HC11
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the B9 millimeter wave radar sensor assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B9-8 (IGB) - Body ground Engine switch on (IG) 11 to 14 V
      B9-8 (IGB) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      B9-1 (SGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

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


    1. Disconnect the Q2 driving support ECU assembly connector.

    2. Disconnect the B9 millimeter wave radar sensor assembly connector.

    3. Disconnect the W18 forward recognition camera connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q2-8 (CA1P) - B9-5 (CA1P) Always Below 1 Ω
      Q2-9 (CA1N) - B9-6 (CA1N) Always Below 1 Ω
      Q2-8 (CA1P) or B9-5 (CA1P) - Body ground Always 10 kΩ or higher
      Q2-9 (CA1N) or B9-6 (CA1N) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly with a new one.

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    2. Perform millimeter wave radar sensor assembly adjustment.

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      Result
      Proceed to
      NEXT

  6. Click here

    CHECK FOR DTCs


    1. Clear the DTCs.


      1. Powertrain > Radar Cruise > Clear DTCs


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

      Tip:

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


      1. Turn the engine switch on (IG).

      2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF button).

      3. Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

    3. Check for DTCs.


      1. Powertrain > Radar Cruise > Trouble Codes


      Result
      Result Proceed to
      DTC U0235 and U1104 are not output A
      DTC U0235 or U1104 is output B

    • A

      END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    • B

      REPLACE DRIVING SUPPORT ECU ASSEMBLYClick here