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 millimeter wave radar sensor and driving support ECU assembly transmit the data for general vehicle control and diagnosis function via CAN communication. The millimeter wave radar sensor assembly transmits information about the vehicle in front to the driving support ECU assembly.

DTC No. DTC Detection Condition Trouble Area
U0235 While the vehicle speed is 36 km/h (or 22 mph) or more and the dynamic radar cruise control system is operating (vehicle-to-vehicle distance control mode), a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 0.8 seconds or more.

  • CAN communication system

  • Millimeter wave radar sensor circuit

  • Millimeter wave radar sensor assembly

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

  • CAN communication system

  • Millimeter wave radar sensor circuit

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

WIRING DIAGRAM

A0007N9E07

CAUTION / NOTICE / HINT

Note


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

  • When the millimeter wave radar sensor 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 that the CAN communication system is functioning normally.

      OK
      CAN communication system is functioning normally.

      Tech Tips

      Refer to CAN Bus Check for the CAN communication system Click here.


    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

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


    1. A00073KE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the A77 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 Condition Specified Condition
      A77-8 (IGB) - Body ground Power switch switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-1 (SGND) - Body ground Always Below 1 Ω

    4. Turn the power switch off.

    5. Reconnect the A77 millimeter wave radar sensor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H196 driving support ECU assembly connector.

    2. Disconnect the A77 millimeter wave radar sensor assembly connector.

    3. Disconnect the T12 forward recognition camera connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H196-8 (CA1P) - A77-5 (CA1P) Always Below 1 Ω
      H196-9 (CA1N) - A77-6 (CA1N) Always Below 1 Ω
      H196-8 (CA1P) or A77-5 (CA1P) - Body ground Always 10 kΩ or higher
      H196-9 (CA1N) or A77-6 (CA1N) - Body ground Always 10 kΩ or higher

    5. Reconnect the T12 forward recognition camera connector.

    6. Reconnect the A77 millimeter wave radar sensor assembly connector.

    7. Reconnect the H196 driving support ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    Click here


    NEXT

  5. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    Click here


    NEXT

  6. CHECK FOR DTCs (DTC U0235, U1104)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

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

      Tech Tips

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

    5. Enter the following menus: Powertrain / Radar Cruise2 / Trouble Codes.

    6. Check for DTCs.

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

    7. Turn the power switch off.


    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here