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

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

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 will be stored.

DTC No. DTC Detection Condition Trouble Area
B156E No response to the diagnostic memory request from the master unit.

  • 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
B156B*1 A device that is listed in the AVC-LAN connected device record of the master unit is missing.

Tech Tips


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

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

WIRING DIAGRAM

A01NGI2E01

INSPECTION PROCEDURE

Note

When replacing the display and navigation module display, perform vehicle contract setting (w/ G-BOOK system) Click here.

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 if the same DTC is output again.

      OK
      No DTCs are output.

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR


    1. A01NE86E01

      Disconnect the U9 multi-media interface ECU connector.

    2. A01NEHLE01

      Disconnect the G24 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
      U9-12 (+B) - G24-12 (+B) Always Below 1 Ω
      U9-11 (ACC) - G24-11 (ACC) Always Below 1 Ω
      U9-7 (GND) - G24-7 (GND) Always Below 1 Ω
      U9-9 (TX1+) - G24-9 (TXM+) Always Below 1 Ω
      U9-10 (TX1-) - G24-10 (TXM-) Always Below 1 Ω
      U9-12 (+B) - Body ground Always 10 kΩ or higher
      U9-11 (ACC) - Body ground Always 10 kΩ or higher
      U9-7 (GND) - Body ground Always 10 kΩ or higher
      U9-9 (TX1+) - Body ground Always 10 kΩ or higher
      U9-10 (TX1-) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multi-media Interface ECU)
      *2

      Front view of wire harness connector

      (to Display and Navigation Module Display)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the G24 display and navigation module display connector.

    2. A01NE86E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multi-media Interface ECU)

      Disconnect the U9 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
      U9-7 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U9-12 (+B) - U9-7 (GND) Power switch off 11 to 14 V
      U9-11 (ACC) - U9-7 (GND) Power switch on (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. Recheck for DTCs and check if the same DTC is output again.

      OK
      No DTCs are output.

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

    END