NAVIGATION SYSTEM (for HDD), Diagnostic DTC:B1591, B15D1

DTC Code DTC Name
B1591 No Response from Audio HU
B15D1 Audio HU Disconnected

DESCRIPTION

The display and navigation module display and the radio receiver assembly are connected by the MOST communication line.

When a MOST communication error occurs between the display and navigation module display and the radio receiver assembly, these DTCs will be stored.

DTC No. DTC Detection Condition Trouble Area
B1591 No response to the diagnostic memory request from the master unit.

  • Radio receiver assembly power source circuit

  • MOST circuit between remote touch and radio receiver assembly

  • MOST circuit between radio receiver assembly and stereo component amplifier assembly

  • Radio receiver assembly

  • Display and navigation module display
B15D1 A device that is listed in the MOST network connected device record of the master unit is missing.

Tech Tips

For the MOST network, the display and navigation module display is the master unit.

WIRING DIAGRAM

A01NFWUE01

INSPECTION PROCEDURE

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • When replacing the display and navigation module display, perform vehicle contract setting (w/ G-BOOK system) Click here.

PROCEDURE


  1. CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    1. Check for optional components.


      1. Check that optional components (including associated wiring) which generate radio waves are not installed.

        Result
        Result Proceed to
        Optional components (including associated wiring) are installed. A
        Optional components (including associated wiring) are not installed. B

        Tech Tips


        • Electrical noise from radio waves generated by optional components or the wiring for those components may affect MOST communication.

        • This DTC may be stored when a MOST communication error occurs due to electrical noise.


    B

    CHECK DTC Click here

    A

  2. REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    1. Remove optional components (including associated wiring).

      Note

      Do not remove optional components or associated wiring without the permission of the customer.


    NEXT

  3. CHECK DTC


    1. Clear the DTCs Click here.

    2. Recheck for DTCs and check if the same DTC is output again.

      OK
      No DTCs are output.

    NG

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY POWER SOURCE) Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY POWER SOURCE)


    1. A01NCWRE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)

      Disconnect the G12 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G12-15 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G12-14 (B) - G12-15 (GND) Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR


    1. A01NCWRE04

      Disconnect the G12 radio receiver assembly connector.

    2. A01NFJ2E03

      Disconnect the G14 remote touch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G12-9 (MI+) - G14-1 (MO+) Always Below 1 Ω
      G12-23 (MI-) - G14-2 (MO-) Always Below 1 Ω
      G12-10 (SLDI) - G14-3 (SLDO) Always Below 1 Ω
      G12-9 (MI+) - Body ground Always 10 kΩ or higher
      G12-23 (MI-) - Body ground Always 10 kΩ or higher
      G12-10 (SLDI) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)
      *2

      Front view of wire harness connector

      (to Remote Touch)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR


    1. A01NCWRE05

      Disconnect the G12 radio receiver assembly connector.

    2. A01NHK0E01

      Disconnect the O15 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
      G12-11 (MO+) - O15-4 (MI+) Always Below 1 Ω
      G12-25 (MO-) - O15-10 (MI-) Always Below 1 Ω
      G12-24 (SLDI) - O15-5 (SLDI) Always Below 1 Ω
      G12-11 (MO+) - Body ground Always 10 kΩ or higher
      G12-25 (MO-) - Body ground Always 10 kΩ or higher
      G12-24 (SLDI) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)
      *2

      Front view of wire harness connector

      (to Stereo Component Amplifier Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE RADIO RECEIVER ASSEMBLY


    1. Replace the radio receiver assembly Click here.

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

    END