NAVIGATION SYSTEM, Diagnostic DTC:B156C

DTC Code DTC Name
B156C Extension Module Disconnected

DESCRIPTION

The navigation ECU and the radio and display receiver assembly are connected by the AVC-LAN communication line.

This DTC is stored when an AVC-LAN communication error occurs between the navigation ECU and the radio and display receiver assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
B156C Extension Module Disconnected

When either condition below is met:


  • Navigation ECU is/was not connected while the power switch is/was on (ACC or IG).

  • Communication between the master unit and the navigation ECU is not possible when the hybrid control system is/was started.

  • Navigation ECU power source circuit

  • AVC-LAN circuit between radio and display receiver assembly and navigation ECU

  • Navigation ECU

  • Radio and display receiver assembly

  • Harness or connector

Tech Tips

The radio and display receiver assembly is the master unit.

WIRING DIAGRAM

A01KT6TE11
*a Radio and Display Receiver Assembly
*b Navigation ECU

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

    GO TO STEP 3 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.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    2. Recheck for DTCs and check that no DTCs are output.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  4. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU POWER SOURCE)


    1. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V1-32 (GND2) - 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
      V1-16 (+B2) - V1-32 (GND2) Power switch off 11 to 14 V
      V1-11 (ACC2) - V1-32 (GND2) Power switch on (ACC) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)


    1. Disconnect the V3 radio and display receiver assembly connector.

    2. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V1-2 (TX+) - V3-9 (TX+) Always Below 1 Ω
      V1-3 (TX-) - V3-10 (TX-) Always Below 1 Ω
      V1-2 (TX+) - Body ground Always 10 kΩ or higher
      V1-3 (TX-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE NAVIGATION ECU


    1. Replace the navigation ECU.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  7. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)


    1. Disconnect the V2 radio and display receiver assembly connector.

    2. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V1-11 (ACC2) - V2-13 (ACC2) Always Below 1 Ω
      V1-16 (+B2) - V2-1 (+B2) Always Below 1 Ω
      V1-32 (GND2) - V2-14 (GND2) Always Below 1 Ω
      V1-11 (ACC2) - Body ground Always 10 kΩ or higher
      V1-16 (+B2) - Body ground Always 10 kΩ or higher
      V1-32 (GND2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR