NAVIGATION 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. DTC Detection Condition Trouble Area
B15D0 MOST network cannot be established.

  • MOST line check

  • MOST communication line connector

  • MOST communication line

  • Stereo component amplifier assembly

  • Television display assembly

  • Navigation ECU sub-assembly

Tech Tips


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

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

WIRING DIAGRAM

A01CF4FE01

INSPECTION PROCEDURE

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 Navigation System Click here.

PROCEDURE


  1. PERFORM MOST LINE CHECK


    1. A01CFCYE01
      Text in Illustration
      *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
      "NCON" is displayed for "REAR". 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 (NAVIGATION ECU SUB-ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    A

  2. CHECK MOST COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the navigation ECU sub-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

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


    1. Disconnect the F30 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
      F30-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - NAVIGATION ECU SUB-ASSEMBLY) Click here

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - NAVIGATION ECU SUB-ASSEMBLY)


    1. Disconnect the F30 stereo component amplifier assembly connector.

    2. Disconnect the F31 navigation ECU sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F30-8 (WUI) - F31-1 (WUO) Always Below 1 Ω
      F30-8 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

  5. CHECK MOST COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the television display 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 "REAR". 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

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


    1. Disconnect the S4 television display assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      S4-8 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    OK

    REPLACE TELEVISION DISPLAY ASSEMBLY Click here

  7. CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the S4 television display assembly connector.

    2. Disconnect the F30 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
      S4-8 (WUI) - F30-1 (WUO) Always Below 1 Ω
      S4-8 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the F31 navigation ECU sub-assembly connector.

    2. Disconnect the F30 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
      F31-5 (MO+) - F30-2 (MI+) Always Below 1 Ω
      F31-6 (MO-) - F30-3 (MI-) Always Below 1 Ω
      F31-7 (SLDO) - F30-4 (SLDI) Always Below 1 Ω
      F31-1 (WUO) - F30-8 (WUI) Always Below 1 Ω
      F31-5 (MO+) - Body ground Always 10 kΩ or higher
      F31-6 (MO-) - Body ground Always 10 kΩ or higher
      F31-7 (SLDO) - Body ground Always 10 kΩ or higher
      F31-1 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)


    1. Disconnect the F30 stereo component amplifier assembly connector.

    2. Disconnect the S4 television display assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F30-5 (MO+) - S4-2 (MI+) Always Below 1 Ω
      F30-6 (MO-) - S4-3 (MI-) Always Below 1 Ω
      F30-7 (SLDO) - S4-4 (SLDI) Always Below 1 Ω
      F30-1 (WUO) - S4-8 (WUI) Always Below 1 Ω
      F30-5 (MO+) - Body ground Always 10 kΩ or higher
      F30-6 (MO-) - Body ground Always 10 kΩ or higher
      F30-7 (SLDO) - Body ground Always 10 kΩ or higher
      F30-1 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)


    1. Disconnect the F31 navigation ECU sub-assembly connector.

    2. Disconnect the S4 television display assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S4-5 (MO+) - F31-2 (MI+) Always Below 1 Ω
      S4-6 (MO-) - F31-3 (MI-) Always Below 1 Ω
      S4-7 (SLDO) - F31-4 (SLDI) Always Below 1 Ω
      S4-5 (MO+) - Body ground Always 10 kΩ or higher
      S4-6 (MO-) - Body ground Always 10 kΩ or higher
      S4-7 (SLDO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REPLACE TELEVISION DISPLAY ASSEMBLY


    1. Replace the television display assembly Click here.

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    OK

    END

  12. 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 that no DTCs are output.

      OK
      No DTCs are output.

    NG

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

    OK

    END