AUDIO AND VISUAL SYSTEM(for 12.3 Inch Display), Diagnostic DTC:B15D0

DTC Code DTC Name
B15D0 MOST Communication Malfunction

DESCRIPTION

This DTC is stored when the MOST network cannot be established after the master unit is activated.

DTC No. Detection Item DTC Detection Condition Trouble Area
B15D0 MOST Communication Malfunction MOST network cannot be established.

  • MOST network

  • MOST communication line

  • Stereo component amplifier assembly

  • Radio receiver assembly

  • Harness or connector

Tech Tips


  • The radio receiver assembly is the master unit.

  • Errors may occur in MOST communication between devices due to problems such as electrical noise.

WIRING DIAGRAM

B002DWKE03
*a (Shielded)
*b Radio Receiver Assembly
*c Stereo Component Amplifier Assembly
*d MOST Communication Line

PROCEDURE


  1. CHECK RESULT OF SYSTEM CHECK MODE


    1. B002COEC03
      *a Node position number for devices connected to the MOST network
      *b Device Name
      *c Result

      Enter the "System Check Mode" screen. Refer to Check DTC (Check Using System Check Mode Screen) in DTC Check / Clear.

      Click here

    2. Check the result on the "System Check Mode" screen.

      Result
      Result Proceed to
      "MOST" is displayed for "EMV-M". A
      "DETAIL" is displayed for "EMV-M". B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. PERFORM MOST LINE CHECK


    1. B002CKUC04
      *a Node position number for devices connected to the MOST network
      *b Device Name
      *c Result

      Enter the "MOST Line Check" screen. Refer to Check DTC (Check Using System Check Mode Screen) in DTC Check / Clear.

      Click here

    2. Check the connectors and terminals of the MOST communication lines between the radio receiver assembly and stereo component amplifier assembly for connection problems.

    3. Check the result on the "MOST Line Check" screen.

      Result
      Result Proceed to
      "OK" is displayed for all items. A
      "NCON" is displayed for "AMP". B
      "NCON" is displayed for "EMV-M". C

      Tech Tips


      • When "NCON" is displayed for more than 1 item, proceed to the step for the device that has the smallest node position number.

      • The "MOST Line Check" screen can be displayed only when DTC B15D0 is stored.


    B

    CHECK HARNESS AND CONNECTOR (WAKE-UP SIGNAL) Click here

    C

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the K115 radio receiver assembly connector.

    2. Disconnect the T41 stereo component amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K115-2 (MI+) - T41-5 (MO+) Always Below 1 Ω
      K115-3 (MI-) - T41-6 (MO-) Always Below 1 Ω
      K115-4 (SLDI) - T41-7 (SLDO) Always Below 1 Ω
      K115-5 (MO+) - T41-2 (MI+) Always Below 1 Ω
      K115-6 (MO-) - T41-3 (MI-) Always Below 1 Ω
      K115-7 (SLDO) - T41-4 (SLDI) Always Below 1 Ω
      K115-2 (MI+) or T41-5 (MO+) - Body ground Always 10 kΩ or higher
      K115-3 (MI-) or T41-6 (MO-) - Body ground Always 10 kΩ or higher
      K115-4 (SLDI) or T41-7 (SLDO) - Body ground Always 10 kΩ or higher
      K115-5 (MO+) or T41-2 (MI+) - Body ground Always 10 kΩ or higher
      K115-6 (MO-) or T41-3 (MI-) - Body ground Always 10 kΩ or higher
      K115-7 (SLDO) or T41-4 (SLDI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. Replace the stereo component amplifier assembly with a new or known good one.

      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 RECEIVER ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (WAKE-UP SIGNAL)


    1. Disconnect the T41 stereo component amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T41-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    NG

  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the K115 radio receiver assembly connector.

    2. Disconnect the T41 stereo component amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K115-1 (WUO) - T41-8 (WUI) Always Below 1 Ω
      K115-1 (WUO) or T41-8 (WUI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR