CAN COMMUNICATION SYSTEM(for LHD) Navigation ECU Communication Stop Mode

DTC Code DTC Name
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 "CAN Bus Check".

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

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  • Power source or inside navigation ECU sub-assembly

  • Navigation ECU sub-assembly CAN branch wire or connector

  • Navigation ECU sub-assembly

  • Engine stop and start ECU*

*: w/ Stop and Start System

  • For vehicles with a navigation receiver type.

WIRING DIAGRAM

C277479E03

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 inspection procedure.

  • DTC check procedure: Turn the ignition switch to ON and wait at least 60 seconds

  • 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.

PROCEDURE

  1. CHECK FOR OPEN IN CAN BUS WIRE (NAVIGATION ECU SUB-ASSEMBLY CAN BRANCH WIRE)

    1. E140414C06

      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly)

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

    2. 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

      G139-9 (CANH) - G139-10 (CANL)

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE NAVIGATION ECU SUB-ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - BATTERY AND BODY GROUND)

    1. C277477C03

      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-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. Disconnect the navigation ECU sub-assembly connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G139-1 (IG) - Body ground

      Ignition switch ON

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G137-7 (GND1) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - BATTERY)

    1. C277478C04

      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G137-4 (+B1) - Body ground

      Always

      11 to 14 V

      G137-3 (ACC1) - Body ground

      Ignition switch ACC

      11 to 14 V

    Result

    Proceed to

    OK

    NG (w/o Stop and Start System)

    NG (w/ Stop and Start System)
    OK

    REPLACE NAVIGATION ECU SUB-ASSEMBLY

    Click here

    NG (w/o Stop and Start System)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG (w/ Stop and Start System)

  4. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - ENGINE STOP AND START ECU)

    1. Disconnect the G87 engine stop and start ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G137-4 (+B1) - G87-2 (BO1)

      Always

      Below 1 Ω

      G137-3 (ACC1) - G87-3 (ACO)

      Always

      Below 1 Ω

      G137-4 (+B1) - Body ground

      Always

      10 kΩ or higher

      G137-3 (ACC1) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ENGINE STOP AND START ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR