NAVIGATION SYSTEM(for HDD), Diagnostic DTC:B1591 and 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 No.

Detection Item

DTC Detection Condition

Trouble Area

B1591

No Response from Audio HU

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.

  • Harness or connector

  • Radio receiver assembly

  • Stereo component amplifier assembly

  • Multi-display controller sub-assembly*1

  • Display and navigation module display*2

B15D1

Audio HU Disconnected

Either condition is met:

  • Radio receiver assembly is/was not connected while the engine switch is on (IG or ACC).

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

  • Harness or connector

  • Radio receiver assembly

  • Stereo component amplifier assembly

  • Multi-display controller sub-assembly*1

  • Display and navigation module display*2

  • *1: w/ Rear Seat Entertainment System

  • *2: w/o Rear Seat Entertainment System

Tip:

  • B15D1: 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

E205517E03

CAUTION / NOTICE / HINT

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
        Tip:

        • 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 DTCClick 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.

      Result

      Result

      NEXT
    NEXT

  3. 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

    Result

    OK

    NG
    OK

    END (OPTIONAL COMPONENTS IS DEFECTIVE)

    NG

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

    1. E192430C06

      *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

      Result

      Result

      OK

      NG
    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 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

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

      Always

      Below 1 Ω

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

      Always

      Below 1 Ω

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

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE RADIO RECEIVER ASSEMBLY

    1. Replace the radio receiver assembly

      Click hereClick here

    2. Clear the DTCs

      Click here

      Body Electrical > Navigation System > Clear DTCs

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

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

      Result

      Result

      OK

      NG
    OK

    END (RADIO RECEIVER IS DEFECTIVE)

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

    Click hereClick here

  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

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE RADIO RECEIVER ASSEMBLY

    1. Replace the radio receiver assembly

      Click hereClick here

    2. Clear the DTCs

      Click here

      Body Electrical > Navigation System > Clear DTCs

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

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

      Result

      Result

      OK

      NG
    OK

    END (RADIO RECEIVER IS DEFECTIVE)

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

    Click hereClick here