NAVIGATION SYSTEM(for HDD) Speaker Circuit

DTC Code DTC Name
Speaker Circuit

DESCRIPTION

The sound signals amplified by the navigation ECU sub-assembly are sent to the speakers from the navigation ECU sub-assembly via the speaker circuit.

If there is a short in a speaker circuit, the navigation ECU sub-assembly detects it and stops output to the speakers.

Thus sound cannot be heard from the speakers even if there is no malfunction in the navigation ECU sub-assembly or speakers.

WIRING DIAGRAM

E226481E25

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - SPEAKERS)

    • *1: for Front Speaker Area

    • *2: for Rear Speaker Area

    • *3: for LH Side

    • *4: for RH Side

    1. Disconnect the G137*1 and/or G138*2 navigation ECU sub-assembly connector.

    2. Disconnect the H3*3 and/or H1*4 front No. 2 speaker assembly connector.

    3. Disconnect the L2*3 and/or K2*4 rear speaker assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G137-1 (FR+) - H1-4 (TWR+)

      Always

      Below 1 Ω

      G137-5 (FR-) - H1-2 (TWR-)

      Always

      Below 1 Ω

      G137-2 (FL+) - H3-4 (TWL+)

      Always

      Below 1 Ω

      G137-6 (FL-) - H3-2 (TWL-)

      Always

      Below 1 Ω

      G138-1 (RR+) - K2-1

      Always

      Below 1 Ω

      G138-3 (RR-) - K2-2

      Always

      Below 1 Ω

      G138-2 (RL+) - L2-1

      Always

      Below 1 Ω

      G138-6 (RL-) - L2-2

      Always

      Below 1 Ω

      G137-1 (FR+) - Body ground

      Always

      10 kΩ or higher

      G137-5 (FR-) - Body ground

      Always

      10 kΩ or higher

      G137-2 (FL+) - Body ground

      Always

      10 kΩ or higher

      G137-6 (FL-) - Body ground

      Always

      10 kΩ or higher

      G138-1 (RR+) - Body ground

      Always

      10 kΩ or higher

      G138-3 (RR-) - Body ground

      Always

      10 kΩ or higher

      G138-2 (RL+) - Body ground

      Always

      10 kΩ or higher

      G138-6 (RL-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK FRONT NO. 2 SPEAKER ASSEMBLY

    1. Check that the malfunction disappears when a known good speaker is installed.

      Click hereClick here

      Tip:

      • Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.

      • When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.

      • Perform the above inspection on both LH and RH sides.

    2. Proceed to the next step based on the inspection result.

    Result

    Proceed to

    Malfunction disappears

    Malfunction does not disappear
    Malfunction disappears

    END (FRONT NO. 2 SPEAKER ASSEMBLY IS DEFECTIVE)

    Malfunction does not disappear

  3. CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY)

    • *1: for LH Side

      *2: for RH Side

    1. Disconnect the H3*1 and/or H1*2 front No. 2 speaker assembly connector.

    2. Disconnect the J1*1 and/or I1*2 front No. 1 speaker assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H3-3 (+) - J1-1

      Always

      Below 1 Ω

      H3-1 (-) - J1-2

      Always

      Below 1 Ω

      H1-3 (+) - I1-1

      Always

      Below 1 Ω

      H1-1 (-) - I1-2

      Always

      Below 1 Ω

      H3-3 (+) - Body ground

      Always

      10 kΩ or higher

      H3-1 (-) - Body ground

      Always

      10 kΩ or higher

      H1-3 (+) - Body ground

      Always

      10 kΩ or higher

      H1-1 (-) - Body ground

      Always

      10 kΩ or higher

      J1-1 - Body ground

      Always

      10 kΩ or higher

      J1-2 - Body ground

      Always

      10 kΩ or higher

      I1-1 - Body ground

      Always

      10 kΩ or higher

      I1-2 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

    1. Disconnect the front No. 1 speaker assembly connector.

    2. Inspect the front No. 1 speaker assembly connector.

      Click hereClick here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

    Click hereClick here

    OK

  5. INSPECT REAR SPEAKER ASSEMBLY

    1. Disconnect the rear speaker assembly connector.

    2. Inspect the rear speaker assembly connector.

      Click hereClick here

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

    REPLACE REAR SPEAKER ASSEMBLY

    Click hereClick here