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AUDIO AND VISUAL SYSTEM(except 8 Speakers), Diagnostic DTC:B15D3

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DTC Code DTC Name
B15D3 Stereo Component Amplifier Disconnected
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DESCRIPTION

The radio receiver assembly and stereo component amplifier assembly are connected via MOST communication lines.

When a MOST communication error occurs between the radio receiver assembly and stereo component amplifier assembly, this DTC will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B15D3 Stereo Component Amplifier Disconnected A device that is listed in the MOST network connected device record of the master unit is missing

  • Stereo component amplifier assembly power source circuit

  • MOST circuit between radio receiver assembly and stereo component amplifier assembly

  • Stereo component amplifier assembly

  • Radio receiver assembly

  • Harness or connector
Tip:

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

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

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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

    CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    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
      Tip:

      • Electrical noise from radio waves generated by optional components or the wiring for those components may affect MOST communication.

      • This DTC may be stored when a MOST communication error occurs due to electrical noise.


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    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

  4. Click here

    CHECK DTC


    1. Clear the DTCs.

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

      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY POWER SOURCE)


    1. Disconnect the H99 stereo component amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H99-3 (GND) - Body ground Always Below 1 Ω
      H99-18 (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
      H99-1 (+B) - H99-3 (GND) Power switch off 11 to 14 V
      H99-16 (+B2) - H99-3 (GND) Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick 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 H156 radio receiver assembly connector.

    2. Disconnect the H157 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
      H156-5 (MO+) - H157-2 (MI+) Always Below 1 Ω
      H156-6 (MO-) - H157-3 (MI-) Always Below 1 Ω
      H156-7 (SLDO) - H157-4 (SLDI) Always Below 1 Ω
      H156-2 (MI+) - H157-5 (MO+) Always Below 1 Ω
      H156-3 (MI-) - H157-6 (MO-) Always Below 1 Ω
      H156-4 (SLDI) - H157-7 (SLDO) Always Below 1 Ω
      H156-5 (MO+) or H157-2 (MI+) - Body ground Always 10 kΩ or higher
      H156-6 (MO-) or H157-3 (MI-) - Body ground Always 10 kΩ or higher
      H156-7 (SLDO) or H157-4 (SLDI) - Body ground Always 10 kΩ or higher
      H156-2 (MI+) or H157-5 (MO+) - Body ground Always 10 kΩ or higher
      H156-3 (MI-) or H157-6 (MO-) - Body ground Always 10 kΩ or higher
      H156-4 (SLDI) or H157-7 (SLDO) - 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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    3. Recheck for DTCs and check that no DTCs are output.

      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    • OK

      END

    • NG

      REPLACE RADIO RECEIVER ASSEMBLYClick here