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Home >> Lexus >> 2012 >> LS 460 AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Navigation System (For DVD) (Diagnostic Codes & Symptom Tests) >> NAVIGATION SYSTEM (for DVD) >> DTC B15D0: MOST Communication Malfunction >> Procedure

DTC B15D0: MOST Communication Malfunction: Procedure

  1. CHECK MOST LINE 
    1. Enter the "System Check". Refer to OPERATION CHECK .
      Fig 1: Identifying System Check Mode Screen
      GTY264385Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the result on the "System Check Mode" screen.
      RESULT

      Result Proceed to
      "NCON" is displayed for "AMP". A
      "NCON" is displayed for "AUDIO". B
      "NCON" is displayed for "RSE".*1 C
      "NCON" is displayed for "DVD-P".*2 D
      "OK" is displayed for all items. E
      • *1: w/ Rear Seat Entertainment System
      • *2: w/ Disc Player Assembly

      HINT: 

      • When "NCON" is displayed for more than 1 item, proceed to the step for the device that has the smallest node position number.
      • The "System Check Mode" screen can be displayed only when DTC B15D0 is stored.
      TEXT IN ILLUSTRATION

      *a Node position number for devices that use MOST communication
      *b Device Name
      *c Result

    B → See step   5 

    C → See step   8 

    D → See step   11 

    E → See step   16 

    A: Go to next step 

  2. CHECK MOST COMMUNICATION CONNECTOR 
    1. Check the MOST communication line connectors of the display and navigation module display and stereo component amplifier assembly. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .
    2. Display the "System Check Mode" screen and check the result. Refer to OPERATION CHECK .
      RESULT

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

      HINT: 

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

    B → END 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL) 
    1. Disconnect the R60 stereo component amplifier assembly connector.
      Fig 2: Identifying R60 Stereo Component Amplifier Assembly Connector Terminals
      GTY270042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      R60-3 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Stereo Component Amplifier Assembly)

    NG → See step   4 

    OK → See step   26 

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER) 
    1. Disconnect the L113 radio receiver assembly connector.
    2. Disconnect the R60 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
      L113-26 (WUO) - R60-3 (WUI) Always Below 1 Ω
      L113-26 (WUO) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   27 

  5. CHECK MOST COMMUNICATION CONNECTOR 
    1. Check the MOST communication line connectors of the display and navigation module display and radio receiver assembly. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .
    2. Display the "System Check Mode" screen and check the result. Refer to OPERATION CHECK .
      RESULT

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

      HINT: 

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

    B → END 

    A: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL) 
    1. Disconnect the L113 radio receiver assembly connector.
      Fig 3: Identifying L113 Radio Receiver Assembly Connector Terminals
      GTY277546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      L113-12 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Radio Receiver Assembly)

    NG → See step   7 

    OK → See step   27 

  7. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - RADIO RECEIVER) 
    1. Disconnect the L115 display and navigation module display connector.
    2. Disconnect the L113 radio receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L115-8 (WUO) - L113-12 (WUI) Always Below 1 Ω
      L115-8 (WUO) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   29 

  8. CHECK MOST COMMUNICATION CONNECTOR 
    1. Check the MOST communication line connectors of the stereo component amplifier assembly and television display assembly. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .
    2. Display the "System Check Mode" screen and check the result. Refer to OPERATION CHECK .
      RESULT

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

      HINT: 

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

    B → END 

    A: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL) 
    1. Disconnect the R59*1 or R62*2 television display assembly connector.
      Fig 4: Identifying R59, R62 Television Display Assembly Connector Terminals
      GTY263935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • *1: for 4-Passenger with Ottoman
      • *2: except 4-Passenger with Ottoman
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      for 4-Passenger with Ottoman 

      except 4-Passenger with Ottoman 

      Tester Connection Switch Condition Specified Condition
      R59-7 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Tester Connection Switch Condition Specified Condition
      R62-7 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      TEXT IN ILLUSTRATION

      *A for 4-Passenger with Ottoman
      *B except 4-Passenger with Ottoman
      *a Front view of wire harness connector
      (to Television Display Assembly)
      RESULT

      Result Proceed to
      OK (for 4-Passenger with Ottoman) A
      OK (except 4-Passenger with Ottoman) B
      NG C

    B → See step   34 

    C → See step   10 

    A → See step   28 

  10. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - TELEVISION DISPLAY) 
    1. Disconnect the R60 stereo component amplifier assembly connector.
    2. Disconnect the R59*1 or R62*2 television display assembly connector.
      • *1: for 4-Passenger with Ottoman
      • *2: except 4-Passenger with Ottoman
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for 4-Passenger with Ottoman 

      except 4-Passenger with Ottoman 

      Tester Connection Condition Specified Condition
      R60-9 (WUO) - R59-7 (WUI) Always Below 1 Ω
      R60-9 (WUO) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      R60-9 (WUO) - R62-7 (WUI) Always Below 1 Ω
      R60-9 (WUO) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  11. CHECK MOST COMMUNICATION CONNECTOR 
    1. Check the MOST communication line connectors of the disc player assembly and television display assembly. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .
    2. Display the "System Check Mode" screen and check the result. Refer to OPERATION CHECK .
      RESULT

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

      HINT: 

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

    B → END 

    A: Go to next step 

  12. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL) 
    1. Disconnect the D*1 or R64*2 disc player assembly connector.
      • *1: for 4-Passenger with Ottoman
      • *2: except 4-Passenger with Ottoman
      Fig 5: Identifying D Or R64 Disc Player Assembly Connector Terminals
      GTY276107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      for 4-Passenger with Ottoman 

      except 4-Passenger with Ottoman 

      Tester Connection Switch Condition Specified Condition
      D-9 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      Tester Connection Switch Condition Specified Condition
      R64-9 (WUI) - Body ground Engine switch on (ACC) 4.5 V or higher
      TEXT IN ILLUSTRATION

      *A for 4-Passenger with Ottoman
      *B except 4-Passenger with Ottoman
      *a Front view of wire harness connector
      (to Disc Player Assembly)
      RESULT

      Result Proceed to
      OK (for 4-Passenger with Ottoman) A
      OK (except 4-Passenger with Ottoman) B
      NG (for 4-Passenger with Ottoman) C
      NG (except 4-Passenger with Ottoman) D

    B → See step   33 

    C → See step   13 

    D → See step   15 

    A → See step   32 

  13. CHECK HARNESS AND CONNECTOR (REAR SEAT CONSOLE BOX ASSEMBLY - TELEVISION DISPLAY AND DISC PLAYER) 
    1. Disconnect the R16 rear seat console box assembly connector.
    2. Disconnect the R59 television display assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R16-21 (WUI) - R59-8 (WUO) Always Below 1 Ω
      R16-21 (WUI) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  14. INSPECT REAR SEAT CONSOLE BOX ASSEMBLY 
    1. Remove the rear seat console box assembly. Refer to REMOVAL .
      Fig 6: Inspecting Rear Seat Console Box Assembly
      GTY261025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R16-21 (WUI) - D-9 (WUI) Always Below 1 Ω
      R16-21 (WUI) - Body ground Always 10 kΩ or higher

    NG → See step   31 

    OK → See step   28 

  15. CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY - DISC PLAYER) 
    1. Disconnect the R62 television display assembly connector.
    2. Disconnect the R64 disc player assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R62-8 (WUO) - R64-9 (WUI) Always Below 1 Ω
      R62-8 (WUO) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   34 

  16. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER) 
    1. Disconnect the L113 radio receiver assembly connector.
    2. Disconnect the R60 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
      L113-11 (MO+) - R60-4 (MI+) Always Below 1 Ω
      L113-25 (MO-) - R60-10 (MI-) Always Below 1 Ω
      L113-24 (SLDI) - R60-5 (SLDI) Always Below 1 Ω
      L113-11 (MO+) - Body ground Always 10 kΩ or higher
      L113-25 (MO-) - Body ground Always 10 kΩ or higher
      L113-24 (SLDI) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  17. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - RADIO RECEIVER) 
    1. Disconnect the L115 display and navigation module display connector.
    2. Disconnect the L113 radio receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L115-3 (MO+) - L113-9 (MI+) Always Below 1 Ω
      L115-7 (MO-) - L113-23 (MI-) Always Below 1 Ω
      L115-6 (SLDO) - L113-10 (SLDI) Always Below 1 Ω
      L115-3 (MO+) - Body ground Always 10 kΩ or higher
      L115-7 (MO-) - Body ground Always 10 kΩ or higher
      L115-6 (SLDO) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (w/ Rear Seat Entertainment System [for 4-Passenger with Ottoman]) A
      OK (w/ Rear Seat Entertainment System [except 4-Passenger with Ottoman]) B
      OK (w/o Rear Seat Entertainment System) C
      NG D

    B → See step   22 

    C → See step   24 

    D → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: Go to next step 

  18. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - TELEVISION DISPLAY) 
    1. Disconnect the R60 stereo component amplifier assembly connector.
    2. Disconnect the R59 television display assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R60-6 (MO+) - R59-1 (MI+) Always Below 1 Ω
      R60-12 (MO-) - R59-2 (MI-) Always Below 1 Ω
      R60-11 (SLDO) - R59-3 (SLDI) Always Below 1 Ω
      R60-6 (MO+) - Body ground Always 10 kΩ or higher
      R60-12 (MO-) - Body ground Always 10 kΩ or higher
      R60-11 (SLDO) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (w/ Disc Player Assembly) A
      OK (w/o Disc Player Assembly) B
      NG C

    B → See step   21 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: Go to next step 

  19. INSPECT REAR SEAT CONSOLE BOX ASSEMBLY 
    1. Remove the rear seat console box assembly. Refer to REMOVAL .
      Fig 7: Inspecting Rear Seat Console Box Assembly
      GTY255317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R16-7 (MI+) - D-1 (MI+) Always Below 1 Ω
      R16-8 (MI-) - D-2 (MI-) Always Below 1 Ω
      R16-9 (SLD1) - D-3 (SLD1) Always Below 1 Ω
      R16-12 (MO+) - D-6 (MO+) Always Below 1 Ω
      R16-11 (MO-) - D-5 (MO-) Always Below 1 Ω
      R16-10 (SLD2) - D-4 (SLD2) Always Below 1 Ω
      R16-7 (MI+) - Body ground Always 10 kΩ or higher
      R16-8 (MI-) - Body ground Always 10 kΩ or higher
      R16-9 (SLD1) - Body ground Always 10 kΩ or higher
      R16-12 (MO+) - Body ground Always 10 kΩ or higher
      R16-11 (MO-) - Body ground Always 10 kΩ or higher
      R16-10 (SLD2) - Body ground Always 10 kΩ or higher

    NG → See step   31 

    OK: Go to next step 

  20. CHECK HARNESS AND CONNECTOR (REAR SEAT CONSOLE BOX - TELEVISION DISPLAY) 
    1. Disconnect the R16 rear seat console box assembly connector.
    2. Disconnect the R59 television display assembly connector.
    3. Disconnect the L115 display and navigation module display connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R16-7 (MI+) - R59-6 (MO+) Always Below 1 Ω
      R16-8 (MI-) - R59-5 (MO-) Always Below 1 Ω
      R16-9 (SLD1) - R59-4 (SLDO) Always Below 1 Ω
      R16-12 (MO+) - L115-1 (MI+) Always Below 1 Ω
      R16-11 (MO-) - L115-5 (MI+) Always Below 1 Ω
      R16-10 (SLD2) - L115-2 (SLDI) Always Below 1 Ω
      R16-7 (MI+) - Body ground Always 10 kΩ or higher
      R16-8 (MI-) - Body ground Always 10 kΩ or higher
      R16-9 (SLD1) - Body ground Always 10 kΩ or higher
      R16-12 (MO+) - Body ground Always 10 kΩ or higher
      R16-11 (MO-) - Body ground Always 10 kΩ or higher
      R16-10 (SLD2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  21. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs and check if the same trouble occurs again.

      OK

      No DTCs are output.

    NG → See step   29 

    OK → See step   30 

  22. CHECK HARNESS AND CONNECTOR (DISC PLAYER - TELEVISION DISPLAY AND DISPLAY AND NAVIGATION MODULE DISPLAY) 
    1. Disconnect the R64 disc player assembly connector.
    2. Disconnect the R62 television display assembly connector.
    3. Disconnect the L115 display and navigation module display connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R62-6 (MO+) - R64-1 (MI+) Always Below 1 Ω
      R62-5 (MO-) - R64-2 (MI-) Always Below 1 Ω
      R62-4 (SLDO) - R64-3 (SLD1) Always Below 1 Ω
      R64-6 (MO+) - L115-1 (MI+) Always Below 1 Ω
      R64-5 (MO-) - L115-5 (MI-) Always Below 1 Ω
      R64-4 (SLD2) - L115-2 (SLDI) Always Below 1 Ω
      R62-6 (MO+)- Body ground Always 10 kΩ or higher
      R62-5 (MO-) - Body ground Always 10 kΩ or higher
      R62-4 (SLDO) - Body ground Always 10 kΩ or higher
      R64-6 (MO+) - Body ground Always 10 kΩ or higher
      R64-5 (MO-) - Body ground Always 10 kΩ or higher
      R64-4 (SLD2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  23. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs and check if the same trouble occurs again.

      OK

      No DTCs are output.

    NG → See step   29 

    OK → See step   30 

  24. CHECK HARNESS OR CONNECTOR (STEREO COMPONENT AMPLIFIER - DISPLAY AND NAVIGATION MODULE DISPLAY) 
    1. Disconnect the R60 stereo component amplifier assembly connector.
    2. Disconnect the L115 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
      R60-6 (MO+) - L115-1 (MI+) Always Below 1 Ω
      R60-12 (MO-) - L115-5 (MI-) Always Below 1 Ω
      R60-11 (SLDO) - L115-2 (SLDI) Always Below 1 Ω
      R60-6 (MO+) - Body ground Always 10 kΩ or higher
      R60-12 (MO-) - Body ground Always 10 kΩ or higher
      R60-11 (SLDO) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  25. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs and check if the same trouble occurs again.

      OK

      No DTCs are output.

    NG → See step   29 

    OK → See step   30 

  26. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
  27. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
  28. REPLACE TELEVISION DISPLAY ASSEMBLY. Refer to  REMOVAL 
  29. REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY. Refer to  REMOVAL 
  30. USE SIMULATION METHOD TO CHECK. Refer to  ELECTRONIC CIRCUIT INSPECTION PROCEDURE 
  31. REPLACE REAR SEAT CONSOLE BOX ASSEMBLY. Refer to  REMOVAL 
  32. REPLACE DISC PLAYER ASSEMBLY. Refer to  REMOVAL 
  33. REPLACE DISC PLAYER ASSEMBLY. Refer to  REMOVAL 
  34. REPLACE TELEVISION DISPLAY ASSEMBLY. Refer to  REMOVAL 
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