NAVIGATION SYSTEM (for HDD), 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.

Tech Tips


  • If a short occurs in a speaker circuit, the sound from the corresponding speaker will be low or almost impossible to hear. If the volume is turned up in this situation, to prevent excessive current flow due to the short circuit, the stereo component amplifier assembly stops operating when its output exceeds a certain level. When the operation of the stereo component amplifier assembly stops, the navigation system will not function normally. This is because MOST communication will stop due to the shut down of the amplifier causing an error in the MOST network. The stereo component amplifier assembly will start operating again when the power switch is turned off and back on (ACC) again. However, the amplifier will stop operating again if its output exceeds a certain level. (for 13 speakers)

  • When the stereo component amplifier assembly stops operating and a malfunction occurs in the navigation system due to a short in a speaker circuit, this DTC will be stored. (for 13 speakers)

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

  • Speaker circuit (for 13 speakers)

  • MOST line check

  • MOST communication line connector

  • MOST communication line

  • Radio receiver assembly

  • Stereo component amplifier assembly

  • Remote touch

  • Navigation computer sub-assembly

Tech Tips


  • For the MOST network, the navigation computer sub-assembly is the master unit.

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

WIRING DIAGRAM

A003VLIE02

INSPECTION PROCEDURE

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Model Proceed to
      for 13 speakers A
      except 13 speakers B

    B

    PERFORM MOST LINE CHECK Click here

    A

  2. CONFIRM SYMPTOMS


    1. Power switch off.

    2. Turn the power switch on (ACC) and check if the audio system activates and if the speakers operate.

      Tech Tips


      • Choose a source such as radio so that sound can be output from the speakers.

      • If sound from the speakers is low, turn up the volume.

      Result
      Model Proceed to
      The audio system activates when the power switch is turned on (ACC) but the sound stops being output when the amplifier output exceeds a certain level. A
      Even after the power switch is turned on (ACC), the audio system does not activate and sound is not output from the speakers. B

      Tech Tips


      • If a short occurs in a speaker circuit, the sound from the corresponding speaker will be low or almost impossible to hear. If the volume is turned up in this situation, to prevent excessive current flow due to the short circuit, the stereo component amplifier assembly stops operating when its output exceeds a certain level. When the operation of the stereo component amplifier assembly stops, the navigation system will not function normally. This is because MOST communication will stop due to the shut down of the amplifier causing an error in the MOST network. The stereo component amplifier assembly will start operating again when the power switch is turned off and back on (ACC) again. However, the amplifier will stop operating again if its output exceeds a certain level.

      • When the stereo component amplifier assembly stops operating and a malfunction occurs in the navigation system due to a short in a speaker circuit, this DTC will be stored. In this case, check each speaker circuit and repair or replace malfunctioning parts, and then recheck for DTCs.


    B

    PERFORM MOST LINE CHECK Click here

    A

    GO TO AUDIO AND VISUAL SYSTEM (w/ Navigation System) Click here

  3. PERFORM MOST LINE CHECK


    1. A003YFKE01
      Text in Illustration
      *1 Node position number for devices that use MOST communication
      *2 Device name
      *3 Result

      Display the "MOST Line Check" screen Click here.

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

      Result
      Result Proceed to
      "NCON" is displayed for "AUDIO". A
      "NCON" is displayed for "AMP". B
      "NCON" is displayed for "R-TOUCH". C
      "OK" is displayed for all items. D

      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 MOST COMMUNICATION CONNECTORS Click here

    C

    CHECK MOST COMMUNICATION CONNECTORS Click here

    D

    CHECK HARNESS AND CONNECTOR Click here

    A

  4. CHECK MOST COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the navigation computer sub-assembly and radio receiver assembly has any connection problems Click here.

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

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

      Tech Tips

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


    B

    END

    A

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


    1. Disconnect the H50 radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H50-12 (WUI) - Body ground Power switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H50 radio receiver assembly connector.

    2. Disconnect the H62 navigation computer sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H50-12 (WUI) - H62-8 (WUO) Always Below 1 Ω
      H50-12 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Click here

  7. CHECK MOST 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 Click here.

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

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

      Tech Tips

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


    B

    END

    A

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


    1. Disconnect the H56 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
      H56-3 (WUI) - Body ground Power switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H56 stereo component amplifier assembly connector.

    2. Disconnect the H50 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H56-3 (WUI) - H50-26 (WUO) Always Below 1 Ω
      H56-3 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

  10. CHECK MOST COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the stereo component amplifier assembly and remote touch has any connection problems Click here.

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

      Result
      Result Proceed to
      "NCON" is displayed for "R-TOUCH". A
      The screen cannot be changed to the "MOST Line Check" screen. B

      Tech Tips

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


    B

    END

    A

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


    1. Disconnect the H71 remote touch connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H71-8 (WUI) - Body ground Power switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

    REPLACE REMOTE OPERATION BOARD Click here

  12. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H71 remote touch connector.

    2. Disconnect the H56 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
      H71-8 (WUI) - H56-9 (WUO) Always Below 1 Ω
      H71-8 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  13. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H62 navigation computer sub-assembly connector.

    2. Disconnect the H50 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H62-3 (MO+) - H50-9 (MI+) Always Below 1 Ω
      H62-7 (MO-) - H50-23 (MI-) Always Below 1 Ω
      H62-6 (SLDO) - H50-10 (SLDI) Always Below 1 Ω
      H62-8 (WUO) - H50-12 (WUI) Always Below 1 Ω
      H62-3 (MO+) - Body ground Always 10 kΩ or higher
      H62-7 (MO-) - Body ground Always 10 kΩ or higher
      H62-6 (SLDO) - Body ground Always 10 kΩ or higher
      H62-8 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H50 radio receiver assembly connector.

    2. Disconnect the H56 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
      H50-11 (MO+) - H56-4 (MI+) Always Below 1 Ω
      H50-25 (MO-) - H56-10 (MI-) Always Below 1 Ω
      H50-24 (SLDI) - H56-5 (SLDI) Always Below 1 Ω
      H50-26 (WUO) - H56-3 (WUI) Always Below 1 Ω
      H50-11 (MO+) - Body ground Always 10 kΩ or higher
      H50-25 (MO-) - Body ground Always 10 kΩ or higher
      H50-24 (SLDI) - Body ground Always 10 kΩ or higher
      H50-26 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H56 stereo component amplifier assembly connector.

    2. Disconnect the H71 remote touch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H56-6 (MO+) - H71-6 (MI+) Always Below 1 Ω
      H56-12 (MO-) - H71-5 (MI-) Always Below 1 Ω
      H56-11 (SLDO) - H71-7 (SLDI) Always Below 1 Ω
      H56-9 (WUO) - H71-8 (WUI) Always Below 1 Ω
      H56-6 (MO+) - Body ground Always 10 kΩ or higher
      H56-12 (MO-) - Body ground Always 10 kΩ or higher
      H56-11 (SLDO) - Body ground Always 10 kΩ or higher
      H56-9 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H71 remote touch connector.

    2. Disconnect the H62 navigation computer sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H71-1 (MO+) - H62-1 (MI+) Always Below 1 Ω
      H71-2 (MO-) - H62-5 (MI-) Always Below 1 Ω
      H71-3 (SLDO) - H62-2 (SLDI) Always Below 1 Ω
      H71-1 (MO+) - Body ground Always 10 kΩ or higher
      H71-2 (MO-) - Body ground Always 10 kΩ or higher
      H71-3 (SLDO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. REPLACE REMOTE OPERATION BOARD


    1. Replace the remote operation board Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs and check if the same DTCs are output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    A

    END

  18. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. Replace the stereo component amplifier assembly Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs and check if the same DTCs are output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    A

    END

  19. REPLACE RADIO RECEIVER ASSEMBLY


    1. Replace the radio receiver assembly Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs and check if the same DTCs are output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Click here

    A

    END