NAVIGATION SYSTEM(for HDD), Diagnostic DTC:B15D0

DTC Code DTC Name
B15D0 MOST Communication Malfunction

DESCRIPTION

  • This DTC is stored when the MOST network connections cannot be established after the master unit is activated.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15D0

MOST Communication Malfunction

The MOST network connections cannot be established.

  • Harness or connector

  • Display and navigation module display

  • Stereo component amplifier assembly

  • Radio receiver assembly

  • Multi-display controller sub-assembly*

  • *: w/ Rear Seat Entertainment System

Tip:
  • The MOST network connections cannot be established.

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

WIRING DIAGRAM

E205524E02
E207107E02

PROCEDURE

  1. CHECK MOST LINE

    1. E198691C02

      *a

      Node position number for devices that use MOST communication

      *b

      Device Name

      *c

      Result

      Enter "System Check"

      Click here

    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"*

      C

      "OK" is displayed for all items

      D

      • *: w/ Rear Seat Entertainment System

      Tip:
      • 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.

    B

    CHECK MOST COMMUNICATION CONNECTORClick here

    C

    CHECK MOST COMMUNICATION CONNECTORClick here

    D

    CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - STEREO COMPONENT AMPLIFIER)Click here

    A
  2. CHECK MOST COMMUNICATION CONNECTOR

    1. Check the MOST communication line connector.

      1. Check if the MOST communication line connectors of the display and navigation module display and the stereo component amplifier assembly have any connection problems

        Click here

    2. Enter the "System Check Mode" screen and check the result

      Click here

      Result

      Result

      Proceed to

      "NCON" is displayed for "AMP"

      A

      Screen cannot be changed to "MOST Line Check" screen

      B

      Tip:

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

    B

    USE SIMULATION METHOD TO CHECK

    A
  3. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER)

    1. E192423C02

      *a

      Front view of wire harness connector

      (to Stereo Component Amplifier Assembly)

      Disconnect the R34 stereo component amplifier assembly connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      R34-3 (WUI) - Body ground

      Engine switch on (ACC)

      4.5 V or higher

      Result

      Result

      OK

      NG

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

    NG
  4. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - DISPLAY AND NAVIGATION MODULE DISPLAY)

    1. Disconnect the R34 stereo component amplifier assembly connector.

    2. Disconnect the H2 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

      R34-3 (WUI) - H2-8 (WUO)

      Always

      Below 1 Ω

      R34-3 (WUI) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG

    OK

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK MOST COMMUNICATION CONNECTOR

    1. Check the MOST communication line connector.

      1. Check if the MOST communication line connectors of the stereo component amplifier assembly and radio receiver assembly have any connection problems

        Click here

    2. Enter the "System Check Mode" screen and check the result

      Click here

      Result

      Result

      Proceed to

      "NCON" is displayed for "AUDIO"

      A

      Screen cannot be changed to "MOST Line Check" screen

      B

      Tip:

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

    B

    USE SIMULATION METHOD TO CHECK

    A
  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER)

    1. E192430C08

      *a

      Front view of wire harness connector

      (to Radio Receiver Assembly)

      Disconnect the H1 radio receiver assembly connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H1-12 (WUI) - Body ground

      Engine switch on (ACC)

      4.5 V or higher

      Result

      Result

      OK

      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY

    NG
  7. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)

    1. Disconnect the H1 radio receiver assembly connector.

    2. Disconnect the R34 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

      H1-12 (WUI) - R34-9 (WUO)

      Always

      Below 1 Ω

      H1-12 (WUI) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK MOST COMMUNICATION CONNECTOR

    1. Check the MOST communication line connector.

      1. Check if the MOST communication line connectors of the radio receiver assembly and multi-display controller sub-assembly have any connection problems

        Click here

    2. Enter the "System Check Mode" screen and check the result

      Click here

      Result

      Result

      Proceed to

      "NCON" is displayed for "RSE"

      A

      Screen cannot be changed to "MOST Line Check" screen

      B

      Tip:

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

    B

    USE SIMULATION METHOD TO CHECK

    A
  9. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER)

    1. E192430C05

      *a

      Front view of wire harness connector

      (to Multi-display Controller Sub-assembly)

      Disconnect the H16 multi-display controller sub-assembly connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H16-7 (WUI) - Body ground

      Engine switch on (ACC)

      4.5 V or higher

      Result

      Result

      OK

      NG

    OK

    REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY

    NG
  10. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - RADIO RECEIVER)

    1. Disconnect the H16 multi-display controller sub-assembly connector.

    2. Disconnect the H1 radio receiver assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H16-7 (WUI) - H1-26 (WUO)

      Always

      Below 1 Ω

      H16-7 (WUI) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - STEREO COMPONENT AMPLIFIER)

    1. Disconnect the H2 display and navigation module display connector.

    2. Disconnect the R34 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

      H2-3 (MO+) - R34-4 (MI+)

      Always

      Below 1 Ω

      H2-7 (MO-) - R34-10 (MI-)

      Always

      Below 1 Ω

      H2-6 (SLDO) - R34-5 (SLDI)

      Always

      Below 1 Ω

      H2-3 (MO+) - Body ground

      Always

      10 kΩ or higher

      H2-7 (MO-) - Body ground

      Always

      10 kΩ or higher

      H2-6 (SLDO) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  12. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - RADIO RECEIVER)

    1. Disconnect the R34 stereo component amplifier assembly connector.

    2. Disconnect the H1 radio receiver assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R34-6 (MO+) - H1-9 (MI+)

      Always

      Below 1 Ω

      R34-12 (MO-) - H1-23 (MI-)

      Always

      Below 1 Ω

      R34-11 (SLDO) - H1-10 (SLDI)

      Always

      Below 1 Ω

      R34-6 (MO+) - Body ground

      Always

      10 kΩ or higher

      R34-12 (MO-) - Body ground

      Always

      10 kΩ or higher

      R34-11 (SLDO) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      Proceed to

      OK (w/ Rear Entertainment System)

      A

      OK (w/o Rear Entertainment System)

      B

      NG

      C

    B

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - DISPLAY AND NAVIGATION MODULE DISPLAY)Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A
  13. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTI-DISPLAY CONTROLLER)

    1. Disconnect the H1 radio receiver assembly connector.

    2. Disconnect the H16 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

      H1-11 (MO+) - H16-1 (MI+)

      Always

      Below 1 Ω

      H1-25 (MO-) - H16-2 (MI-)

      Always

      Below 1 Ω

      H1-24 (SLDI) - H16-3 (SLDI)

      Always

      Below 1 Ω

      H1-11 (MO+) - Body ground

      Always

      10 kΩ or higher

      H1-25 (MO-) - Body ground

      Always

      10 kΩ or higher

      H1-24 (SLDI) - Body ground

      Always

      10 kΩ or higher

      Result

      Proceed to

      OK

      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  14. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - DISPLAY AND NAVIGATION MODULE DISPLAY)

    1. Disconnect the H16 multi-display controller sub-assembly connector.

    2. Disconnect the H2 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

      H16-6 (MO+) - H2-1 (MI+)

      Always

      Below 1 Ω

      H16-5 (MO-) - H2-5 (MI-)

      Always

      Below 1 Ω

      H16-4 (SLDO) - H2-2 (SLDI)

      Always

      Below 1 Ω

      H16-6 (MO+) - Body ground

      Always

      10 kΩ or higher

      H16-5 (MO-) - Body ground

      Always

      10 kΩ or higher

      H16-4 (SLDO) - Body ground

      Always

      10 kΩ or higher

      Result

      Proceed to

      OK

      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  15. CHECK FOR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Navigation System > Clear DTCs

    2. Check for DTCs and check if the same trouble occurs again.

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

      Result

      Proceed to

      OK

      NG

    OK

    USE SIMULATION METHOD TO CHECK

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

  16. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - DISPLAY AND NAVIGATION MODULE DISPLAY)

    1. Disconnect the H1 radio receiver assembly connector.

    2. Disconnect the H2 display and navigation module display assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H1-11 (MO+) - H2-1 (MI+)

      Always

      Below 1 Ω

      H1-25 (MO-) - H2-5 (MI-)

      Always

      Below 1 Ω

      H1-24 (SLDI) - H2-2 (SLDI)

      Always

      Below 1 Ω

      H1-11 (MO+) - Body ground

      Always

      10 kΩ or higher

      H1-25 (MO-) - Body ground

      Always

      10 kΩ or higher

      H1-24 (SLDI) - Body ground

      Always

      10 kΩ or higher

      Result

      Proceed to

      OK

      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  17. CHECK FOR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Navigation System > Clear DTCs

    2. Check for DTCs and check if the same trouble occurs again.

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

      Result

      Proceed to

      OK

      NG

    OK

    USE SIMULATION METHOD TO CHECK

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY