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.

WIRING DIAGRAM


  1. A01KTNJE07

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. Disconnect the E137 radio receiver assembly connector.

    2. Disconnect the G1 and H1 front No. 1 speaker assembly connectors.

    3. Disconnect the G4 and H5 front No. 2 speaker assembly connectors.

    4. 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
      E137-1 (FR+) - G4-4 (TWR+) Always Below 1 Ω
      E137-5 (FR-) - G4-2 (TWR-) Always Below 1 Ω
      E137-2 (FL+) - H5-4 (TWL+) Always Below 1 Ω
      E137-6 (FL-) - H5-2 (TWL-) Always Below 1 Ω

    5. 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
      G4-3 (+) - G1-1 Always Below 1 Ω
      G4-1 (-) - G1-2 Always Below 1 Ω
      H5-3 (+) - H1-1 Always Below 1 Ω
      H5-1 (-) - H1-2 Always Below 1 Ω

    6. 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
      E137-1 (FR+) - Body ground Always 10 kΩ or higher
      E137-5 (FR-) - Body ground Always 10 kΩ or higher
      E137-2 (FL+) - Body ground Always 10 kΩ or higher
      E137-6 (FL-) - Body ground Always 10 kΩ or higher

    7. 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
      G4-3 (+) - Body ground Always 10 kΩ or higher
      G4-1 (-) - Body ground Always 10 kΩ or higher
      H5-3 (+) - Body ground Always 10 kΩ or higher
      H5-1 (-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY


    1. Remove the front No. 1 speaker assembly.

      Click here

    2. A01KRZGC37
      *a

      Component without harness connected

      (Front No. 1 Speaker Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 3.2 to 4.8 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

    OK

  3. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY


    1. Remove the front No. 2 speaker assembly.

      Click here

    2. A01KTMOC16
      *A for RH
      *B for LH
      *a

      Component without harness connected

      (Front No. 2 Speaker Assembly)

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      4 (TWR+) - 2 (TWR-) Always 10 kΩ or higher
      1 (-) - 2 (TWR-) Always Below 1 Ω
      3 (+) - 4 (TWR+) Always Below 1 Ω
      for LH
      Tester Connection Condition Specified Condition
      4 (TWL+) - 2 (TWL-) Always 10 kΩ or higher
      1 (-) - 2 (TWL-) Always Below 1 Ω
      3 (+) - 4 (TWL+) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    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 new or 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 No. 2 speaker assembly is defective, inspect by interchanging the right one with the left one.

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

      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT NO. 2 SPEAKER ASSEMBLY WAS DEFECTIVE)

    NG

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