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AUDIO AND VISUAL SYSTEM(for 10.3 Inch Display), Diagnostic DTC:B15D0

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DTC Code DTC Name
B15D0 MOST Communication Malfunction
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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 line check

  • MOST communication line connector

  • MOST communication line

  • Stereo component amplifier assembly

  • Radio receiver assembly
Tip:

  • For the MOST network, the radio receiver assembly is the master unit.

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

Table 1. *a (Shielded) *b Radio Receiver Assembly *c Stereo Component Amplifier Assembly *d Most Communication Line
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.

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  • When replacing the radio receiver assembly, always replace it with a new one. If a radio receiver assembly which was installed to another vehicle is used, the following may occur:


    • A communication malfunction DTC may be stored.

    • The radio receiver assembly may not operate normally.

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PROCEDURE


  1. Click here

    CHECK RESULT OF SYSTEM CHECK MODE


    1. B006691C01
      *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.

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

      Result
      Result Proceed to
      "MOST" is displayed for "DCU". A
      "DETAIL" is displayed for "DCU". B

  2. Click here

    PERFORM MOST LINE CHECK


    1. B0067TDC01
      *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.

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    2. Check if the MOST communication lines connectors and terminals of the radio receiver assembly, 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 "DCU". C
      Tip:

      • 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.


  3. Click here

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


    1. Disconnect the j1 radio receiver assembly connector.

    2. Disconnect the T34 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
      j1-2 (MI+) - T34-5 (MO+) Always Below 1 Ω
      j1-3 (MI-) - T34-6 (MO-) Always Below 1 Ω
      j1-4 (SLDI) - T34-7 (SLDO) Always Below 1 Ω
      j1-5 (MO+) - T34-2 (MI+) Always Below 1 Ω
      j1-6 (MO-) - T34-3 (MI-) Always Below 1 Ω
      j1-7 (SLDO) - T34-4 (SLDI) Always Below 1 Ω
      j1-2 (MI+) or T34-5 (MO+) - Body ground Always 10 kΩ or higher
      j1-3 (MI-) or T34-6 (MO-) - Body ground Always 10 kΩ or higher
      j1-4 (SLDI) or T34-7 (SLDO) - Body ground Always 10 kΩ or higher
      j1-5 (MO+) or T34-2 (MI+) - Body ground Always 10 kΩ or higher
      j1-6 (MO-) or T34-3 (MI-) - Body ground Always 10 kΩ or higher
      j1-7 (SLDO) or T34-4 (SLDI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY


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

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    2. Clear the DTCs.


      1. Body Electrical > Navigation System > Clear DTCs


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


      1. Body Electrical > Navigation System > Trouble Codes


      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    • OK

      END

    • NG

      REPLACE RADIO RECEIVER ASSEMBLYClick here

  5. Click here

    CHECK HARNESS AND CONNECTOR (WAKE-UP SIGNAL)


    1. Disconnect the T34 stereo component amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      T34-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Result
      Proceed to
      OK
      NG

  6. Click here

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


    1. Disconnect the j1 radio receiver assembly connector.

    2. Disconnect the T34 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
      j1-1 (WUO) - T34-8 (WUI) Always Below 1 Ω
      j1-1 (WUO) or T34-8 (WUI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE RADIO RECEIVER ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR