AUDIO AND VISUAL SYSTEM 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

A004HZBE16

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
      D14-1 (FR+) - D39-4 (+) Always Below 1 Ω
      D14-5 (FR-) - D39-2 (-) Always Below 1 Ω
      D14-2 (FL+) - D66-4 (+) Always Below 1 Ω
      D14-6 (FL-) - D66-2 (-) 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
      D66-3 (+) - E6-1 Always Below 1 Ω
      D66-1 (-) - E6-2 Always Below 1 Ω
      D39-3 (+) - F9-1 Always Below 1 Ω
      D39-1 (-) - F9-2 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
      D13-1 (RR+) - G15-1 Always Below 1 Ω
      D13-3 (RR-) - G15-2 Always Below 1 Ω
      D13-2 (RL+) - H24-1 Always Below 1 Ω
      D13-6 (RL-) - H24-2 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
      D14-1 (FR+) - Body ground Always 10 kΩ or higher
      D14-5 (FR-) - Body ground Always 10 kΩ or higher
      D14-2 (FL+) - Body ground Always 10 kΩ or higher
      D14-6 (FL-) - Body ground Always 10 kΩ or higher
      D13-1 (RR+) - Body ground Always 10 kΩ or higher
      D13-3 (RR-) - Body ground Always 10 kΩ or higher
      D13-2 (RL+) - Body ground Always 10 kΩ or higher
      D13-6 (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
      D66-3 (+) - Body ground Always 10 kΩ or higher
      D66-1 (-) - Body ground Always 10 kΩ or higher
      D39-3 (+) - Body ground Always 10 kΩ or higher
      D39-1 (-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY


    1. A004JS2E02
      Text in Illustration
      *A for RH
      *B for LH
      *a

      Component without harness connected

      (Front No. 1 Speaker Assembly)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        E6-1 - E6-2 Always 3.4 to 4.6 Ω
        F9-1 - F9-2 Always 3.4 to 4.6 Ω

    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

    OK

  3. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY


    1. A004IHBE02
      Text in Illustration
      *A for RH
      *B for LH
      *a

      Component without harness connected

      (Front No. 2 Speaker Assembly)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        D39-1 (-) - D39-3 (+) Always 3.4 to 4.6 Ω
        D39-4 (+) - D39-2 (-) Always 10 kΩ or higher
        D39-3 (+)- D39-4 (+) Always Below 1 Ω
        D39-1 (-) - D39-2 (-) Always Below 1 Ω
        D66-1 (-) - D66-3 (+) Always 3.4 to 4.6 Ω
        D66-4 (+) - D66-2 (-) Always 10 kΩ or higher
        D66-3 (+) - D66-4 (+) Always Below 1 Ω
        D66-1 (-) - D66-2 (-) Always Below 1 Ω

    NG

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY Click here

    OK

  4. INSPECT REAR SPEAKER ASSEMBLY


    1. A004JYBE02
      Text in Illustration
      *A for RH
      *B for LH
      *a

      Component without harness connected

      (Rear Speaker Assembly)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        H24-1 - H24-2 Always 5.1 to 6.9 Ω
        G15-1 - G15-2 Always 5.1 to 6.9 Ω

    OK

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

    NG

    REPLACE REAR SPEAKER ASSEMBLY Click here