NAVIGATION SYSTEM (for DVD), Diagnostic DTC:B156A, B1590

DTC Code DTC Name
B156A Gateway ECU Disconnected
B1590 No Response from Gateway ECU

DESCRIPTION

The display and navigation module display and the network gateway 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 network gateway ECU, these DTCs will be stored.

DTC No. DTC Detection Condition Trouble Area
B156A*1 A device that is listed in the AVC-LAN connected device record of the master unit is missing.

  • Network gateway ECU power source circuit

  • AVC-LAN circuit between display and navigation module display and network gateway ECU

  • Display and navigation module display

  • Network gateway ECU
B1590 No response to the diagnostic memory request from the master unit.

Tech Tips


  • *1: 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

A01610IE09

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. REPLACE 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 (NETWORK GATEWAY ECU POWER SOURCE) Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU POWER SOURCE)


    1. Disconnect the J76 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J76-24 (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
      J76-10 (BATT) - J76-24 (GND) Always 11 to 14 V
      J76-2 (ACC) - J76-24 (GND) Engine switch on (ACC) 11 to 14 V
      J76-1 (IG) - J76-24 (GND) Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (AVC-LAN COMMUNICATION LINE)


    1. Disconnect the J124 display and navigation module display connector.

    2. Disconnect the J76 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J124-12 (TX2+) - J76-6 (GTX+) Always Below 1 Ω
      J124-13 (TX2-) - J76-21 (GTX-) Always Below 1 Ω
      J124-12 (TX2+) - Body ground Always 10 kΩ or higher
      J124-13 (TX2-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE NETWORK GATEWAY ECU


    1. Replace the network gateway 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