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

  • Multi-display controller sub-assembly*1

  • Multi-media module receiver assembly

Tech Tips


  • For the MOST network, the multi-media module receiver assembly is the master unit.

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

WIRING DIAGRAM


  1. w/ Rear Seat Entertainment System

    A01NKG7E03

  2. w/o Rear Seat Entertainment System

    A01NIK9E04

INSPECTION PROCEDURE

Note


    w/ G-BOOK System:

  • When replacing the multi-media module receiver assembly or telematics transceiver, perform vehicle contract setting (w/ Telematics Transceiver) Click here.

  • When replacing the multi-media module receiver assembly, perform vehicle contract setting (w/o Telematics Transceiver) Click here.

PROCEDURE


  1. CHECK DTC


    1. If DTC B15C3 is output, perform the troubleshooting of DTC B15C3 first.

      Result
      Result Proceed to
      DTC B15C3 is not output. A
      DTC B15C3 is output. B

    B

    GO TO DTC "B15C3" IN DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. PERFORM MOST LINE CHECK


    1. A01NL3HE01
      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" (w/ Rear Seat Entertainment System). 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 (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    A

  3. CHECK MOST COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the multi-media module 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

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


    1. Disconnect the O43 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
      O43-8 (WUI) - Body ground Power switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY) Click here

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

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


    1. Disconnect the O43 stereo component amplifier assembly connector.

    2. Disconnect the G45 multi-media module receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O43-8 (WUI) - G45-1 (WUO) Always Below 1 Ω
      O43-8 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  6. CHECK MOST COMMUNICATION CONNECTORS


    1. Check the MOST communication line connectors.


      1. Check if the MOST communication line connector between the multi-display controller 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 "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

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


    1. Disconnect the O44 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
      O44-8 (WUI) - Body ground Power switch on (ACC) 4.5 V or higher

    NG

    CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    OK

    REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY Click here

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


    1. Disconnect the O44 multi-display controller sub-assembly connector.

    2. Disconnect the O43 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
      O44-8 (WUI) - O43-1 (WUO) Always Below 1 Ω
      O44-8 (WUI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the G45 multi-media module receiver assembly connector.

    2. Disconnect the O43 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
      G45-5 (MO+) - O43-2 (MI+) Always Below 1 Ω
      G45-6 (MO-) - O43-3 (MI-) Always Below 1 Ω
      G45-7 (SLDO) - O43-4 (SLDI) Always Below 1 Ω
      G45-1 (WUO) - O43-8 (WUI) Always Below 1 Ω
      G45-5 (MO+) - Body ground Always 10 kΩ or higher
      G45-6 (MO-) - Body ground Always 10 kΩ or higher
      G45-7 (SLDO) - Body ground Always 10 kΩ or higher
      G45-1 (WUO) - Body ground Always 10 kΩ or higher

    4. Proceed to the next step based on the inspection result.

      Result
      Condition Proceed to
      OK (w/o Rear Seat Entertainment System) A
      OK (w/ Rear Seat Entertainment System) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  10. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the O43 stereo component amplifier assembly connector.

    2. Disconnect the G45 multi-media module receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O43-5 (MO+) - G45-2 (MI+) Always Below 1 Ω
      O43-6 (MO-) - G45-3 (MI-) Always Below 1 Ω
      O43-7 (SLDO) - G45-4 (SLDI) Always Below 1 Ω
      O43-5 (MO+) - Body ground Always 10 kΩ or higher
      O43-6 (MO-) - Body ground Always 10 kΩ or higher
      O43-7 (SLDO) - Body ground Always 10 kΩ or higher

    4. Proceed to the next step based on the inspection result.

      Result
      Condition Proceed to
      NG A
      OK B

    B

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the O43 stereo component amplifier assembly connector.

    2. Disconnect the O44 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
      O43-5 (MO+) - O44-2 (MI+) Always Below 1 Ω
      O43-6 (MO-) - O44-3 (MI-) Always Below 1 Ω
      O43-7 (SLDO) - O44-4 (SLDI) Always Below 1 Ω
      O43-1 (WUO) - O44-8 (WUI) Always Below 1 Ω
      O43-5 (MO+) - Body ground Always 10 kΩ or higher
      O43-6 (MO-) - Body ground Always 10 kΩ or higher
      O43-7 (SLDO) - Body ground Always 10 kΩ or higher
      O43-1 (WUO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY)


    1. Disconnect the G45 multi-media module receiver assembly connector.

    2. Disconnect the O44 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
      O44-5 (MO+) - G45-2 (MI+) Always Below 1 Ω
      O44-6 (MO-) - G45-3 (MI-) Always Below 1 Ω
      O44-7 (SLDO) - G45-4 (SLDI) Always Below 1 Ω
      O44-5 (MO+) - Body ground Always 10 kΩ or higher
      O44-6 (MO-) - Body ground Always 10 kΩ or higher
      O44-7 (SLDO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY


    1. Replace the multi-display controller sub-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 STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    OK

    END

  14. 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 MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

    END