CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) Millimeter Wave Radar Sensor Communication Stop Mode

DESCRIPTION

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

Either condition is met:


  • "Front Radar" is not displayed on the CAN Bus Check screen of the GTS Click here.

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

  • Millimeter wave radar sensor assembly branch line or connector

  • Power source circuit of millimeter wave radar sensor assembly

  • Millimeter wave radar sensor assembly ground circuit

  • Millimeter wave radar sensor assembly

WIRING DIAGRAM

A0006V7E04

CAUTION / NOTICE / HINT

Note


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

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  • 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 Click here.

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

  • DTC check procedure: Turn the power switch on (IG), turn the LDA main switch on, wait at least 7 seconds and then drive the vehicle at a speed of 36 km/h (22 mph) or more for 2.6 seconds or more.

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

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY BRANCH LINE)


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

    2. A000786E02
      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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-3 (CA2H) - A77-2 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Check the millimeter wave radar sensor assembly power source circuit Click here.


    OK

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)