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 engine switch is turned off and back on (ACC) again. However, the amplifier will stop operating again if its output exceeds a certain level. (w/ front center speaker)

  • 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. (w/ front center speaker)

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

  • Speaker circuit (w/ front center speaker)

  • MOST line check

  • MOST communication line connector

  • MOST communication line

  • Radio receiver assembly

  • Stereo component amplifier assembly

  • Display and navigation module display

Tech Tips


  • For the MOST network, the display and navigation module display is the master unit.

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

WIRING DIAGRAM

A015ZMZE04

INSPECTION PROCEDURE

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Model Proceed to
      w/ Front center speaker A
      w/o Front center speaker B

    B

    PERFORM MOST LINE CHECK Click here

    A

  2. CONFIRM SYMPTOMS


    1. Engine switch off.

    2. Turn the engine 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 engine switch is turned on (ACC) but the sound stops being output when the amplifier output exceeds a certain level. A
      Even after the engine 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 engine 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. A015YUME01
      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
      "OK" is displayed for all items. C

      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 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 display and navigation module display and radio receiver assembly have 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 J106 radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J106-12 (WUI) - Body ground Engine 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 J106 radio receiver assembly connector.

    2. Disconnect the J123 display and navigation module display connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J106-12 (WUI) - J123-8 (WUO) Always Below 1 Ω
      J106-12 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY 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 have 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 P43 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
      P43-3 (WUI) - Body ground Engine 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 P43 stereo component amplifier assembly connector.

    2. Disconnect the J106 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P43-3 (WUI) - J106-26 (WUO) Always Below 1 Ω
      P43-3 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

  10. CHECK HARNESS AND CONNECTOR


    1. Disconnect the J123 display and navigation module display connector.

    2. Disconnect the J106 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J123-3 (MO+) - J106-9 (MI+) Always Below 1 Ω
      J123-7 (MO-) - J106-23 (MI-) Always Below 1 Ω
      J123-6 (SLDO) - J106-10 (SLDI) Always Below 1 Ω
      J123-8 (WUO) - J106-12 (WUI) Always Below 1 Ω
      J123-3 (MO+) - Body ground Always 10 kΩ or higher
      J123-7 (MO-) - Body ground Always 10 kΩ or higher
      J123-6 (SLDO) - Body ground Always 10 kΩ or higher
      J123-8 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR


    1. Disconnect the J106 radio receiver assembly connector.

    2. Disconnect the P43 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
      J106-11 (MO+) - P43-4 (MI+) Always Below 1 Ω
      J106-25 (MO-) - P43-10 (MI-) Always Below 1 Ω
      J106-24 (SLDI) - P43-5 (SLDI) Always Below 1 Ω
      J106-26 (WUO) - P43-3 (WUI) Always Below 1 Ω
      J106-11 (MO+) - Body ground Always 10 kΩ or higher
      J106-25 (MO-) - Body ground Always 10 kΩ or higher
      J106-24 (SLDI) - Body ground Always 10 kΩ or higher
      J106-26 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR


    1. Disconnect the P43 stereo component amplifier assembly connector.

    2. Disconnect the J123 display and navigation module display connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P43-6 (MO+) - J123-1 (MI+) Always Below 1 Ω
      P43-12 (MO-) - J123-5 (MI-) Always Below 1 Ω
      P43-11 (SLDO) - J123-2 (SLDI) Always Below 1 Ω
      P43-6 (MO+) - Body ground Always 10 kΩ or higher
      P43-12 (MO-) - Body ground Always 10 kΩ or higher
      P43-11 (SLDO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK DTC


    1. Clear the DTCs Click here.

    2. Recheck for DTCs and check if the same DTC is output again.

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

    B

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here