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

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

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 in front of the vehicle to the driving support ECU assembly. The driving support ECU assembly sends this information to the power management control ECU and the power management control ECU operates the dynamic radar cruise control system.

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.

  • 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 1 second.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

  • Harness or connector

WIRING DIAGRAM

B001MZ8E03

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, make sure to replace it with a new one. If a device 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, and as a result, a DTC may be stored.

  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor 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.

    Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      Click here

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

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

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


    1. Disconnect the H185 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
      H185-7 (B) - Body ground Power switch on (IG) 11 to 14 V
      H185-7 (B) - Body ground Power switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      H185-28 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B001M1GC08
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the k1 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
      k1-8 (IGB) - Body ground Power switch on (IG) 11 to 14 V
      k1-8 (IGB) - Body ground Power switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      k1-1 (SGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H185 driving support ECU assembly connector.

    2. Disconnect the k1 millimeter wave radar sensor assembly connector.

    3. Disconnect the T13 forward recognition camera connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H185-8 (CA1P) - k1-5 (CA1P) Always Below 1 Ω
      H185-9 (CA1N) - k1-6 (CA1N) Always Below 1 Ω
      H185-8 (CA1P) or k1-5 (CA1P) - Body ground Always 10 kΩ or higher
      H185-9 (CA1N) or k1-6 (CA1N) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Turn the power 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.

      Click here

      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 ASSEMBLY Click here