CAN COMMUNICATION SYSTEM Navigation ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Navigation ECU Communication Stop Mode

  • "AVN1" is not displayed on the "Communication Bus Check" screen of the intelligent tester.

  • Applies to "Navigation ECU Communication Stop Mode" in the "DTC Combination Table"

  • Navigation ECU branch line or connector

  • Power source circuit of navigation ECU

  • Navigation ECU

WIRING DIAGRAM

A01NHOYE01
A01NDHAE01

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

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 OPEN IN CAN BUS WIRE (NAVIGATION ECU BRANCH WIRE)


    1. Turn the power switch off.

    2. A01NDYVE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Navigation ECU)

      Disconnect the navigation ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G4-21 (CANH) - G4-22 (CANL) Power switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (NAVIGATION ECU BRANCH WIRE)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01NDYVE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Navigation ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G4-1 (+B1) - Body ground Always 11 to 14 V
      G4-2 (ACC) - Body ground Power switch on (ACC) 11 to 14 V
      G4-3 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. Turn the power switch off.

    2. A01NDYVE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Navigation ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G4-10 (GND1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for DVD) A
      OK (for HDD) B
      NG C

    B

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (for HDD) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)

    A

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (for DVD) Click here