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

When an AVC-LAN communication error occurs between the navigation computer sub-assembly and multi-media interface ECU assembly, 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 assembly power source circuit

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

  • Multi-media interface ECU assembly

  • Navigation computer sub-assembly
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 auxiliary battery condition or hybrid system start voltage.

  • The navigation computer sub-assembly is the master unit.

WIRING DIAGRAM

A003YWWE16

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 if the same DTCs are output again.

      OK
      No DTCs are output.

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H69 multi-media interface ECU assembly connector.

    2. Disconnect the H63 navigation computer sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H69-12 (+B) - H63-12 (+B) Always Below 1 Ω
      H69-11 (ACC) - H63-11 (ACC) Always Below 1 Ω
      H69-7 (GND) - H63-7 (GND) Always Below 1 Ω
      H69-9 (TX1+) - H63-9 (TX+) Always Below 1 Ω
      H69-10 (TX1-) - H63-10 (TX-) Always Below 1 Ω
      H69-12 (+B) - Body ground Always 10 kΩ or higher
      H69-11 (ACC) - Body ground Always 10 kΩ or higher
      H69-7 (GND) - Body ground Always 10 kΩ or higher
      H69-9 (TX1+) - Body ground Always 10 kΩ or higher
      H69-10 (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 ASSEMBLY POWER SOURCE)


    1. Reconnect the H63 navigation computer sub-assembly connector.

    2. Disconnect the H69 multi-media interface ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H69-7 (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
      H69-12 (+B) - H69-7 (GND) Power switch off 11 to 14 V
      H69-11 (ACC) - H69-7 (GND) Power switch on (ACC) 11 to 14 V

    NG

    REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Click here

    OK

  6. REPLACE MULTI-MEDIA INTERFACE ECU ASSEMBLY


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

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Click here

    OK

    END