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

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

DESCRIPTION

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

When an AVC-LAN communication error occurs between the display and navigation module display and the multi-media interface ECU, these DTCs are stored.

DTC Code DTC Detection Condition Trouble Area
B156B*

When either condition below is met:


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

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

  • Multi-media interface ECU power source circuit

  • AVC-LAN circuit between display and navigation module display and multi-media interface ECU

  • Multi-media interface ECU

  • Display and navigation module display
B156E

Within the time-out period, there is no response from the stereo component amplifier to the following requests from the master unit:


  • The system inspection request.

  • The system inspection result request.

  • The diagnostic memory request.

Tech Tips


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

  • The display and navigation module display is the master unit.

WIRING DIAGRAM

A00JZARE04

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 FOR DTC Click here

    A

  2. REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    1. Remove the optional components (including associated wiring).

      Note

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


    NEXT

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs and check if the same trouble occurs again.

      OK
      No DTCs are output.

    NG

    CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - DISPLAY AND NAVIGATION MODULE DISPLAY) Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - DISPLAY AND NAVIGATION MODULE DISPLAY)


    1. Disconnect the H18 multi-media interface ECU connector.

    2. Disconnect the H15 display and navigation module display connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H18-9 (TX1+) - H15-9 (TXM+) Always Below 1 Ω
      H18-10 (TX1-) - H15-10 (TXM-) Always Below 1 Ω
      H18-9 (TX1+) - Body ground Always 10 kΩ or higher
      H18-10 (TX1-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A00JUOGE26
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Interface ECU)

      Disconnect the H18 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
      H18-7 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H18-12 (+B) - H18-7 (GND) Always 11 to 14 V
      H18-11 (ACC) - H18-7 (GND) Ignition switch ACC 11 to 14 V

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

  6. REPLACE MULTI-MEDIA INTERFACE ECU


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

    2. Clear the DTCs Click here.

    3. Check for DTCs and check if the same trouble occurs again.

      OK
      No DTCs are output.

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

    END