AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) Speaker Circuit

DESCRIPTION

The sound signals amplified by the radio receiver assembly are sent to the speakers from the radio receiver assembly via the speaker circuit.

If there is a short in a speaker circuit, the radio receiver 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 radio receiver assembly or speakers.

If a short is detected in a speaker circuit, no sound can be heard from the speakers.

WIRING DIAGRAM

A011WUPE05

INSPECTION PROCEDURE

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR

    1. Disconnect the connectors from the radio receiver assembly and speakers.

    2. Measure the resistance between each of the front No. 2 speaker assemblies and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I148-1 (FR+) - I83-4 (TWR+) Always Below 1 Ω
      I148-5 (FR-) - I83-2 (TWR-) Always Below 1 Ω
      I148-2 (FL+) - I1-4 (TWL+) Always Below 1 Ω
      I148-6 (FL-) - I1-2 (TWL-) Always Below 1 Ω

    3. Measure the resistance between each of the front No. 1 speaker assemblies and the front No. 2 speaker assemblies to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-1 (-) - K5-2 Always Below 1 Ω
      I1-3 (+) - K5-1 Always Below 1 Ω
      I83-1 (-) - J5-2 Always Below 1 Ω
      I83-3 (+) - J5-1 Always Below 1 Ω

    4. Measure the resistance between each of the rear speaker assemblies and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I149-1 (RR+) - O18-1 Always Below 1 Ω
      I149-3 (RR-) - O18-2 Always Below 1 Ω
      I149-2 (RL+) - O21-1 Always Below 1 Ω
      I149-6 (RL-) - O21-2 Always Below 1 Ω

    5. Measure the resistance between the radio receiver assembly and body ground to check for a short circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I148-1 (FR+) - Body ground Always 10 kΩ or higher
      I148-5 (FR-) - Body ground Always 10 kΩ or higher
      I148-2 (FL+) - Body ground Always 10 kΩ or higher
      I148-6 (FL-) - Body ground Always 10 kΩ or higher
      I149-1 (RR+) - Body ground Always 10 kΩ or higher
      I149-3 (RR-) - Body ground Always 10 kΩ or higher
      I149-2 (RL+) - Body ground Always 10 kΩ or higher
      I149-6 (RL-) - Body ground Always 10 kΩ or higher

    6. Measure the resistance between each of the front No. 2 speaker assemblies and body ground to check for a short circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-1 (-) - Body ground Always 10 kΩ or higher
      I1-3 (+) - Body ground Always 10 kΩ or higher
      I83-1 (-) - Body ground Always 10 kΩ or higher
      I83-3 (+) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

    1. Resistance check

      A011VG1E17

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K5-1 - K5-2 Always 3.2 to 4.8 Ω
        J5-1 - J5-2 Always 3.2 to 4.8 Ω
        Text in Illustration
        *A for RH
        *B for LH
        *a

        Component without harness connected

        (Front No. 1 Speaker Assembly)
    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

    OK

  3. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

    1. Resistance check

      A011XFRE09

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        I83-2 (TWR-) - I83-4 (TWR+) Always 10 kΩ or higher
        I83-1 (-)- I83-2 (TWR-) Always Below 1 Ω
        I83-3 (+) - I83-4 (TWR+) Always Below 1 Ω
        I1-2 (TWL-) - I1-4 (TWL+) Always 10 kΩ or higher
        I1-1(-) - I1-2 (TWL-) Always Below 1 Ω
        I1-3 (+) - I1-4 (TWL+) Always Below 1 Ω
        Text in Illustration
        *A for RH
        *B for LH
        *a

        Component without harness connected

        (Front No. 2 Speaker Assembly)
    NG

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY Click here

    OK

  4. REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

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

      OK
      Malfunction disappears.

      Tech Tips

      • 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.

    NG

    INSPECT REAR SPEAKER ASSEMBLY Click here

    OK

    END (FRONT NO. 2 SPEAKER ASSEMBLY WAS DEFECTIVE)

  5. INSPECT REAR SPEAKER ASSEMBLY

    1. Resistance check

      A011VG1E18

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        O21-1 - O21-2 Always 3.2 to 4.8 Ω
        O18-1 - O18-2 Always 3.2 to 4.8 Ω
        Text in Illustration
        *A for RH
        *B for LH
        *a

        Component without harness connected

        (Rear Speaker Assembly)
    NG

    REPLACE REAR SPEAKER ASSEMBLY Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here