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, this DTC will be stored.

DTC Code DTC Detection Condition Trouble Area
B1591

Within the time-out period, there is no response from the radio receiver assembly to the following requests from the master unit:


  • The system inspection request.

  • The system inspection result request.

  • The diagnostic memory request.

  • Radio receiver assembly power source circuit

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

  • MOST circuit between radio receiver assembly and television display assembly*2

  • MOST circuit between radio receiver assembly and display and navigation module display*3

  • Radio receiver assembly

  • Stereo component amplifier assembly

  • Television display assembly*2

  • Display and navigation module display*3
B15D1*1

Either condition is met:


  • The radio receiver assembly is/was not connected while the ignition switch is ON (IG or ACC).

  • Communication between the master unit and radio receiver assembly is not possible when the engine is started.

Tech Tips


  • *1: Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.

  • The display and navigation module display is the master unit.

WIRING DIAGRAM

A0094N4E01

INSPECTION PROCEDURE

Note

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

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 FOR DTC Click here

    A

  2. REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    1. Remove the optional components (including associated wiring).

      Note

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


    NEXT

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs and check if the same trouble occurs 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. A0099JSE23
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Radio Receiver Assembly)

      Disconnect the H1 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H1-15 (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
      H1-14 (B) - H1-15 (GND) Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H1 radio receiver assembly connector.

    2. Disconnect the H11 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
      H1-9 (MI+) - H11-6 (MO+) Always Below 1 Ω
      H1-23 (MI-) - H11-12 (MO-) Always Below 1 Ω
      H1-10 (SLDI) - H11-11 (SLDO) Always Below 1 Ω
      H1-9 (MI+) - Body ground Always 10 kΩ or higher
      H1-23 (MI-) - Body ground Always 10 kΩ or higher
      H1-10 (SLDI) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Rear Seat Entertainment System) A
      OK (w/o Rear Seat 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

  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - TELEVISION DISPLAY)


    1. Disconnect the H1 radio receiver assembly connector.

    2. Disconnect the W14 television 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+) - W14-1 (MI+) Always Below 1 Ω
      H1-25 (MO-) - W14-2 (MI-) Always Below 1 Ω
      H1-24 (SLDI) - W14-3 (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

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

      OK
      No DTCs are output.

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

    END

  8. 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 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE RADIO RECEIVER ASSEMBLY


    1. Replace the radio receiver assembly Click here.

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

    END