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AUDIO AND VISUAL SYSTEM(w/ Parallel Parking Assist Function), 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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PROCEDURE


  1. Click here

    CHECK DTC


    1. If DTC B15C3 is output, perform troubleshooting for DTC B15C3 first.

      Result
      Result Proceed to
      DTC B15C3 is not output. A
      DTC B15C3 is output. B

  2. Click here

    PERFORM MOST LINE CHECK


    1. B00670FC01
      *a Node position number for devices that use MOST communication
      *b Device Name
      *c Result

      Display the "MOST Line Check" screen.

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

      Result
      Result Proceed to
      "NCON" is displayed for "AMP". A
      "OK" is displayed for all items. B
      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.


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    CHECK COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the radio receiver assembly and stereo component amplifier assembly has any connection problems.

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    2. Display the "MOST Line Check" screen and check the result.

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      Result
      Result Proceed to
      "NCON" is displayed for "AMP". A
      The screen cannot be changed to the "MOST Line Check" screen. B
      Tip:

      When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.


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    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

  5. 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
      T34-8 (WUI) - j1-1 (WUO) Always Below 1 Ω
      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

  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
      j1-5 (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
      j1-1 (WUO) - T34-8 (WUI) Always Below 1 Ω
      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+) - Body ground Always 10 kΩ or higher
      j1-6 (MO-) - Body ground Always 10 kΩ or higher
      j1-7 (SLDO) - Body ground Always 10 kΩ or higher
      j1-1 (WUO) - Body ground Always 10 kΩ or higher
      j1-2 (MI+) - Body ground Always 10 kΩ or higher
      j1-3 (MI-) - Body ground Always 10 kΩ or higher
      j1-4 (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.

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      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