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CAN COMMUNICATION SYSTEM(for RHD with Central Gateway ECU) Millimeter Wave Radar Sensor Communication Stop Mode

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DTC Code DTC Name
  Millimeter Wave Radar Sensor Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
Millimeter Wave Radar Sensor Communication Stop Mode

Either condition is met:


  • Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "Millimeter Wave Radar Sensor Communication Stop Mode" in "DTC Combination Table".

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  • Power source or inside of millimeter wave radar sensor assembly

  • Millimeter wave radar sensor assembly ground circuit

  • Millimeter wave radar sensor assembly CAN branch wire or connector

  • Millimeter wave radar sensor assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Drive the vehicle at a speed of 5 km/h (approximately 4 mph) or more for 7 seconds or more.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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Tip:

  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

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PROCEDURE


  1. Click here

    CHECK FOR OPEN IN CAN BUS WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN BRANCH WIRE)


    1. B0027LEC65
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the millimeter wave radar sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A64-3 (CA2H) - A64-2 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result Proceed to
      OK (w/o Stop and Start System) A
      OK (w/ Stop and Start System) B
      NG C

    • AClick here
    • BClick here
    • C

      REPAIR OR REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CA2H, CA2L)

  2. Click here

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


    1. B0027LEC66
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Connect the cable to the negative (-) battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A64-8 (IGB) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A64-1 (SGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick 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. B0027LEC66
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Connect the cable to the negative (-) battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A64-8 (IGB) - Body ground Ignition switch ON 10.5 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A64-1 (SGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (IGB terminal) B
      NG (SGND terminal) C

    • A

      REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

    • B

      GO TO STOP AND START SYSTEMClick here

    • C

      REPAIR OR REPLACE HARNESS OR CONNECTOR