NAVIGATION SYSTEM(except Sedan), Diagnostic DTC:B156C

DTC Code DTC Name
B156C Extension Module Disconnected

DESCRIPTION

The navigation ECU and the radio and display receiver assembly are connected by the AVC-LAN communication line.

This DTC is stored when an AVC-LAN communication error occurs between the navigation ECU and the radio and display receiver assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B156C

Extension Module Disconnected

When either condition below is met:

  • Navigation ECU is/was not connected while the ignition switch is/was ON or ACC.

  • Communication between the master unit and the navigation ECU is not possible when the engine is/was started.

  • Navigation ECU power source circuit

  • AVC-LAN circuit between radio and display receiver assembly and navigation ECU

  • Navigation ECU

  • Radio and display receiver assembly

  • Harness or connector
Tip:

The radio and display receiver assembly is the master unit.

WIRING DIAGRAM

E226303E11

PROCEDURE

  1. CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

    1. Check for optional components.

      1. Check that optional components (including associated wiring) which generate radio waves are not installed.

        Result

        Result

        Proceed to

        Optional components (including associated wiring) are installed.

        A

        Optional components (including associated wiring) are not installed.

        B
        Tip:

        • Electrical noise from radio waves generated by optional components or the wiring for those components may affect AVC-LAN communication.

        • This DTC may be stored when an AVC-LAN communication error occurs due to electrical noise.

    B

    CHECK DTCClick here

    A

  2. REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

    1. Remove optional components (including associated wiring).

      Note:

      Do not remove optional components or associated wiring without the permission of the customer.

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Navigation System > Clear DTCs

    2. Recheck for DTCs and check that no DTCs are output.

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

  4. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU POWER SOURCE)

    1. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      V1-32 (GND2) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      V1-16 (+B2) - V1-32 (GND2)

      Always

      11 to 14 V

      V1-11 (ACC2) - V1-32 (GND2)

      Ignition switch ACC

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

    1. Disconnect the V3 radio and display receiver assembly connector.

    2. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      V1-2 (TX+) - V3-9 (TX+)

      Always

      Below 1 Ω

      V1-3 (TX-) - V3-10 (TX-)

      Always

      Below 1 Ω

      V1-2 (TX+) - Body ground

      Always

      10 kΩ or higher

      V1-3 (TX-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE NAVIGATION ECU

    1. Replace the navigation ECU.

      Click here

    2. Clear the DTCs.

      Click here

      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

  7. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

    1. Disconnect the V2 radio and display receiver assembly connector.

    2. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      V1-11 (ACC2) - V2-13 (ACC2)

      Always

      Below 1 Ω

      V1-16 (+B2) - V2-1 (+B2)

      Always

      Below 1 Ω

      V1-32 (GND2) - V2-14 (GND2)

      Always

      Below 1 Ω

      V1-11 (ACC2) - Body ground

      Always

      10 kΩ or higher

      V1-16 (+B2) - Body ground

      Always

      10 kΩ or higher

      V1-32 (GND2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR