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 DTC Combination Table

  • Display and navigation ECU branch wire or connector

  • Power source circuit of navigation ECU

  • Navigation ECU (Navigation receiver assembly)

WIRING DIAGRAM

A01JAHNE01
A01JADME01

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 FOR OPEN IN CAN BUS WIRE (NAVIGATION ECU BRANCH WIRE)


    1. Turn the power switch off.

    2. for HDD:


      1. A01J8R5E02
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Navigation ECU)

        Disconnect the navigation ECU connector.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        L110-2 (CANH) - L110-3 (CANL) Power switch off 54 to 69 Ω

    3. for DVD:


      1. A01J9E3E19
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Navigation ECU)

        Disconnect the navigation ECU connector.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        L37-2 (CANH) - L37-3 (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 CIRCUIT)


    1. for HDD:


      1. Check the navigation receiver power source circuit Click here.

    2. for DVD:


      1. Check the navigation receiver power source circuit Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY (NAVIGATION ECU) Click here