AUDIO AND VISUAL SYSTEM, 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

  • Multi-display controller sub-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

B006EVGE02

CAUTION / NOTICE / HINT

Note


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

  • 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.

Tech Tips

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.

Click here

PROCEDURE


  1. CHECK RESULT OF SYSTEM CHECK MODE


    1. B006EFIC04
      *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. B006ENMC05
      *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 if the MOST communication lines connectors and terminals of the radio receiver assembly, stereo component amplifier assembly and multi-display controller sub-assembly* for connection problems.


      • *: w/ Rear Seat Entertainment System

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

      Result
      Result Proceed to

      "OK" is displayed for all items.

      (w/o Rear Seat Entertainment System)

      		 A

      "OK" is displayed for all items.

      (w/ Rear Seat Entertainment System)

      		 B

      "NCON" is displayed for "AMP".

      (w/o Rear Seat Entertainment System)

      		 C

      "NCON" is displayed for "REAR".

      (w/ Rear Seat Entertainment System)

      		 D

      "NCON" is displayed for "REAR" and "AMP".

      (w/ Rear Seat Entertainment System)

      		 E
      "NCON" is displayed for "DCU". F

      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 (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    C

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

    D

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

    E

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

    F

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    A

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


    1. Disconnect the G136 radio receiver assembly connector.

    2. Disconnect the L159 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
      G136-2 (MI+) - L159-5 (MO+) Always Below 1 Ω
      G136-3 (MI-) - L159-6 (MO-) Always Below 1 Ω
      G136-4 (SLDI) - L159-7 (SLDO) Always Below 1 Ω
      G136-5 (MO+) - L159-2 (MI+) Always Below 1 Ω
      G136-6 (MO-) - L159-3 (MI-) Always Below 1 Ω
      G136-7 (SLDO) - L159-4 (SLDI) Always Below 1 Ω
      G136-2 (MI+) or L159-5 (MO+) - Body ground Always 10 kΩ or higher
      G136-3 (MI-) or L159-6 (MO-) - Body ground Always 10 kΩ or higher
      G136-4 (SLDI) or L159-7 (SLDO) - Body ground Always 10 kΩ or higher
      G136-5 (MO+) or L159-2 (MI+) - Body ground Always 10 kΩ or higher
      G136-6 (MO-) or L159-3 (MI-) - Body ground Always 10 kΩ or higher
      G136-7 (SLDO) or L159-4 (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 (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the G136 radio receiver assembly connector.

    2. Disconnect the L159 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
      G136-5 (MO+) - L159-2 (MI+) Always Below 1 Ω
      G136-6 (MO-) - L159-3 (MI-) Always Below 1 Ω
      G136-7 (SLDO) - L159-4 (SLDI) Always Below 1 Ω
      G136-5 (MO+) or L159-2 (MI+) - Body ground Always 10 kΩ or higher
      G136-6 (MO-) or L159-3 (MI-) - Body ground Always 10 kΩ or higher
      G136-7 (SLDO) or L159-4 (SLDI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY)


    1. Disconnect the L159 stereo component amplifier assembly connector.

    2. Disconnect the L161 multi-display controller sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L159-5 (MO+) - L161-2 (MI+) Always Below 1 Ω
      L159-6 (MO-) - L161-3 (MI-) Always Below 1 Ω
      L159-7 (SLDO) - L161-4 (SLDI) Always Below 1 Ω
      L159-5 (MO+) or L161-2 (MI+) - Body ground Always 10 kΩ or higher
      L159-6 (MO-) or L161-3 (MI-) - Body ground Always 10 kΩ or higher
      L159-7 (SLDO) or L161-4 (SLDI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY)


    1. Disconnect the G136 radio receiver assembly connector.

    2. Disconnect the L161 multi-display controller sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G136-2 (MI+) - L161-5 (MO+) Always Below 1 Ω
      G136-3 (MI-) - L161-6 (MO-) Always Below 1 Ω
      G136-4 (SLDI) - L161-7 (SLDO) Always Below 1 Ω
      G136-2 (MI+) or L161-5 (MO+) - Body ground Always 10 kΩ or higher
      G136-3 (MI-) or L161-6 (MO-) - Body ground Always 10 kΩ or higher
      G136-4 (SLDI) or L161-7 (SLDO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY


    1. Replace the multi-display controller sub-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

  9. 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

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


    1. Disconnect the L159 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
      L159-8 (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

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


    1. Disconnect the G136 radio receiver assembly connector.

    2. Disconnect the L159 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
      G136-1 (WUO) - L159-8 (WUI) Always Below 1 Ω
      G136-1 (WUO) or L159-8 (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

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


    1. Disconnect the L161 multi-display controller sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L161-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY Click here

    NG

  13. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY)


    1. Disconnect the L159 stereo component amplifier assembly connector.

    2. Disconnect the L161 multi-display controller sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L159-1 (WUO) - L161-8 (WUI) Always Below 1 Ω
      L159-1 (WUO) or L161-8 (WUI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the L159 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
      L159-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. 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

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


    1. Disconnect the L161 multi-display controller sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L161-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR