NAVIGATION SYSTEM(for HDD), Diagnostic DTC:B156B and 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 No.

Detection Item

DTC Detection Condition

Trouble Area

B156B

Multi-media Interface ECU Disconnected

Either condition is met:

  • The multi-media interface ECU is/was not connected while the engine switch is on (IG 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

No Response from Multi-media Interface ECU

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

  • The system inspection request.

  • The system inspection result request.

  • The diagnostic memory request.

  • 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
Tip:

  • B156B: 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

E193026E05

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 FOR DTCClick 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.

      Result

      Result

      NEXT
    NEXT

  3. CHECK FOR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Navigation System > Clear DTCs

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

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

      Result

      Result

      OK

      NG
    OK

    END (MULTI-MEDIA INTERFACE ECU IS DEFECTIVE)

    NG

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

    1. E130091C05

      *a

      Front view of wire harness connector

      (to Multi-media Interface ECU)

      Disconnect the H15 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

      H15-7 (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

      H15-12 (+B) - H15-7 (GND)

      Always

      11 to 14 V

      H15-11 (ACC) - H15-7 (GND)

      Engine switch on (ACC)

      11 to 14 V

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Disconnect the H15 multi-media interface ECU connector.

    2. Disconnect the H14 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

      H15-9 (TX1+) - H14-9 (TXM+)

      Always

      Below 1 Ω

      H15-10 (TX1-) - H14-10 (TXM-)

      Always

      Below 1 Ω

      H15-9 (TX1+) - Body ground

      Always

      10 kΩ or higher

      H15-10 (TX1-) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE MULTI-MEDIA INTERFACE ECU

    1. Replace the multi-media interface ECU

      Click hereClick here

    2. Clear the DTCs

      Click here

      Body Electrical > Navigation System > Clear DTCs

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

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

      Result

      Result

      OK

      NG
    OK

    END (MULTI-MEDIA INTERFACE ECU IS DEFECTIVE)

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

    Click hereClick here