CAN COMMUNICATION SYSTEM Navigation ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Navigation ECU Communication Stop Mode

Either condition is met:


  • "Display and Navigation (AVN1)" is not displayed on the "Communication Bus Check" screen of the intelligent tester Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Navigation ECU Communication Stop Mode" in "DTC Combination Table" Click here


  • Navigation ECU sub-assembly branch line or connector

  • Power source circuit of navigation ECU sub-assembly

  • Navigation ECU sub-assembly ground circuit

  • Navigation ECU sub-assembly

WIRING DIAGRAM

A01ETE9E25

INSPECTION PROCEDURE

Note


  • 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 negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) 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 ignition switch to ON and wait at least 31 seconds.

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

Tech Tips


  • Operating the ignition 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 (NAVIGATION ECU SUB-ASSEMBLY BRANCH LINE)


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

    2. A01EW1YE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly)

      Disconnect the navigation ECU sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I67-9 (CANH) - I67-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the navigation ECU sub-assembly connector.

    2. A01ETUVE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I64-7 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I64-3 (ACC1) - Body ground Ignition switch ACC 11 to 14 V
      I64-4 (+B1) - Body ground Ignition switch off 11 to 14 V
      I67-1 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here