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NAVIGATION SYSTEM (for HDD), Diagnostic DTC:B156B, B156E

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DTC Code DTC Name
B156B Multi-media Interface ECU Disconnected
B156E No Response from Multi-media Interface ECU
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DESCRIPTION

The navigation receiver assembly and the multi-media interface ECU are connected by the AVC-LAN communication line.

When an AVC-LAN communication error occurs between the navigation receiver assembly and multi-media interface ECU, these DTCs will be stored.

DTC No. DTC Detection Condition Trouble Area
B156B*1

When either condition below is met:


  • Multi-media interface ECU is/was not connected while the ignition switch is/was ON or ACC.

  • Communication between the master unit and the multi-media interface ECU is not possible when the engine is started.

  • Multi-media interface ECU power source circuit

  • AVC-LAN circuit between navigation receiver assembly and multi-media interface ECU

  • Multi-media interface ECU

  • Navigation receiver assembly
B156E

Within the time-out period, there was no response from the multi-media interface ECU to the following requests from the master unit:


  • System inspection request

  • System inspection result request

  • Diagnostic memory request
Tip:

  • *1: Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.

  • The navigation receiver assembly is the master unit.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    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.


  2. Click here

    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.


  3. Click here

    CHECK DTC


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs and check if the same DTC is output again.

      OK
      No DTCs are output.

  4. Click here

    CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU POWER SOURCE)


    1. Disconnect the E25 multi-media interface ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E25-7 (GND) - 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
      E25-12 (+B) - E25-7 (GND) Always 11 to 14 V
      E25-11 (ACC) - E25-7 (GND) Ignition switch ACC 11 to 14 V

  5. Click here

    CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - NAVIGATION RECEIVER ASSEMBLY)


    1. Disconnect the E25 multi-media interface ECU connector.

    2. Disconnect the E23 navigation receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E25-9 (TX1+) - E23-9 (TXM+) Always Below 1 Ω
      E25-10 (TX1-) - E23-10 (TXM-) Always Below 1 Ω
      E25-9 (TX1+) - Body ground Always 10 kΩ or higher
      E25-10 (TX1-) - Body ground Always 10 kΩ or higher

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    REPLACE MULTI-MEDIA INTERFACE ECU


    1. Replace the multi-media interface ECU (Click here).

    2. Clear the DTCs (Click here).

    3. Recheck for DTCs and check if the same DTC is output again.

      OK
      No DTCs are output.

  7. Click here

    END

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    REPLACE NAVIGATION RECEIVER ASSEMBLYClick here

  11. Click here

    CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - NAVIGATION RECEIVER ASSEMBLY)


    1. Disconnect the E23 navigation receiver assembly connector.

    2. Disconnect the E25 multi-media interface ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E25-11 (ACC) - E23-11 (ACC) Always Below 1 Ω
      E25-12 (+B) - E23-12 (+B) Always Below 1 Ω
      E25-7 (GND) - E23-7 (GND) Always Below 1 Ω
      E25-11 (ACC) - Body ground Always 10 kΩ or higher
      E25-12 (+B) - Body ground Always 10 kΩ or higher
      E25-7 (GND) - Body ground Always 10 kΩ or higher