NAVIGATION SYSTEM (for Radio and Display Type), Diagnostic DTC:B156C

DTC Code DTC Name
B156C Extension Module Disconnected

DESCRIPTION

The extension module 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 extension module and the radio and display receiver assembly.

DTC No. DTC Detection Condition Trouble Area
B156C

When either condition below is met:


  • Extension module is/was not connected while the ignition switch is/was ON or ACC.

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

  • Extension module power source circuit

  • AVC-LAN circuit between radio and display receiver assembly and extension module

  • Extension module

  • Radio and display receiver assembly

  • Harness or connector

Tech Tips

The radio and display receiver assembly is the master unit.

WIRING DIAGRAM

A01EL9QE19

INSPECTION PROCEDURE

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

        Tech Tips


        • 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 DTC Click 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.


    NEXT

  3. CHECK DTC


    1. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    CHECK HARNESS AND CONNECTOR (EXTENSION MODULE POWER SOURCE) Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR (EXTENSION MODULE POWER SOURCE)


    1. Disconnect the V1 extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V1-32 (E) - 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 (B+) - V1-32 (E) Always 11 to 14 V
      V1-11 (ACC) - V1-32 (E) Ignition switch ACC 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)


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

    2. Disconnect the V1 extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V1-2 (AVC+) - V3-9 (AVC+) Always Below 1 Ω
      V1-3 (AVC-) - V3-10 (AVC-) Always Below 1 Ω
      V1-2 (AVC+) - Body ground Always 10 kΩ or higher
      V1-3 (AVC-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE EXTENSION MODULE


    1. Replace the extension module Click here.

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

    END

  7. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)


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

    2. Disconnect the V1 extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V1-11 (ACC) - V2-13 (ACC) Always Below 1 Ω
      V1-16 (B+) - V2-1 (B+) Always Below 1 Ω
      V1-32 (E) - V2-14 (E) Always Below 1 Ω
      V1-11 (ACC) - Body ground Always 10 kΩ or higher
      V1-16 (B+) - Body ground Always 10 kΩ or higher
      V1-32 (E) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here