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. Detection Item DTC Detection Condition Trouble Area
B15D0 MOST Communication Malfunction MOST network cannot be established.

  • MOST line check

  • MOST communication line connector

  • MOST communication line

  • Stereo component amplifier assembly

  • Radio receiver assembly

Tech Tips


  • For the MOST network, the radio receiver assembly is the master unit.

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

WIRING DIAGRAM

A01CZNPE04
*a (Shielded)
*b Radio Receiver Assembly
*c Stereo Component Amplifier Assembly
*d Most Communication Line

CAUTION / NOTICE / HINT

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. CHECK DTC


    1. If DTC B15C3 is output, perform troubleshooting for DTC B15C3 first.

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

    B

    GO TO DTC B15C3 Click here

    A

  2. PERFORM MOST LINE CHECK


    1. A00239IC01
      *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
      "OK" is displayed for all items. B

      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 HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    A

  3. CHECK 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 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 P32 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
      P32-8 (WUI) - Body ground Power switch on (ACC) 4.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the f1 radio receiver assembly connector.

    2. Disconnect the P32 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
      P32-8 (WUI) - f1-1 (WUO) Always Below 1 Ω
      P32-8 (WUI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the f1 radio receiver assembly connector.

    2. Disconnect the P32 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
      f1-5 (MO+) - P32-2 (MI+) Always Below 1 Ω
      f1-6 (MO-) - P32-3 (MI-) Always Below 1 Ω
      f1-7 (SLDO) - P32-4 (SLD1) Always Below 1 Ω
      f1-1 (WUO) - P32-8 (WUI) Always Below 1 Ω
      f1-2 (MI+) - P32-5 (MO+) Always Below 1 Ω
      f1-3 (MI-) - P32-6 (MO-) Always Below 1 Ω
      f1-4 (SLDI) - P32-7 (SLDO) Always Below 1 Ω
      f1-5 (MO+) - Body ground Always 10 kΩ or higher
      f1-6 (MO-) - Body ground Always 10 kΩ or higher
      f1-7 (SLDO) - Body ground Always 10 kΩ or higher
      f1-1 (WUO) - Body ground Always 10 kΩ or higher
      f1-2 (MI+) - Body ground Always 10 kΩ or higher
      f1-3 (MI-) - Body ground Always 10 kΩ or higher
      f1-4 (SLDI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. Replace the stereo component amplifier assembly.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here