AUDIO AND VISUAL SYSTEM Speaker Circuit

DESCRIPTION

When the radio receiver assembly has a built-in type amplifier, a sound signal is sent from the radio receiver assembly to the speakers via this circuit.

WIRING DIAGRAM

A003TWWE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. Disconnect the connectors shown in the illustration from the radio receiver assembly and speakers.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E1-2 (FL+) - I4-4 (TWL+) Always Below 1 Ω
      E1-6 (FL-) - I4-2 (TWL-) Always Below 1 Ω
      E1-1 (FR+) - H4-4 (TWR+) Always Below 1 Ω
      E1-5 (FR-) - H4-2 (TWR-) Always Below 1 Ω

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

      Standard resistance
      Tester Connection Condition Specified Condition
      I4-3 (+) - I1-1 Always Below 1 Ω
      I4-1 (-) - I1-2 Always Below 1 Ω
      H4-3 (+) - H1-1 Always Below 1 Ω
      H4-1 (-) - H1-2 Always Below 1 Ω

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E2-2 (RL+) - K4-1 Always Below 1 Ω
      E2-6 (RL-) - K4-2 Always Below 1 Ω
      E2-1 (RR+) - J4-1 Always Below 1 Ω
      E2-3 (RR-) - J4-2 Always Below 1 Ω

    5. Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.

      Standard resistance
      Tester Connection Condition Specified Condition
      E1-2 (FL+) - Body ground Always 10 kΩ or higher
      E1-6 (FL-) - Body ground Always 10 kΩ or higher
      E1-1 (FR+) - Body ground Always 10 kΩ or higher
      E1-5 (FR-) - Body ground Always 10 kΩ or higher
      I4-3 (+) - Body ground Always 10 kΩ or higher
      I4-1 (-) - Body ground Always 10 kΩ or higher
      H4-3 (+) - Body ground Always 10 kΩ or higher
      H4-1 (-) - Body ground Always 10 kΩ or higher
      E2-2 (RL+) - Body ground Always 10 kΩ or higher
      E2-6 (RL-) - Body ground Always 10 kΩ or higher
      E2-1 (RR+) - Body ground Always 10 kΩ or higher
      E2-3 (RR-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT FRONT NO. 1 SPEAKER


    1. A003S4HE98
      Text in Illustration
      *a

      Component without harness connected

      (Front No. 1 Speaker)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        I1-1 - I1-2 Always 3.2 to 4.8 Ω
        H1-1 - H1-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 1 SPEAKER Click here

    OK

  3. INSPECT FRONT NO. 2 SPEAKER


    1. A003RP3E12
      Text in Illustration
      *A for LH
      *B for RH
      *a

      Component without harness connected

      (Front No. 2 Speaker)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        I4-3 (+) - I4-4 (TWL+) Always Below 1 Ω
        I4-1 (-) - I4-2 (TWL-) Always Below 1 Ω
        I4-4 (TWL+) - I4-2 (TWL-) Always 10 kΩ or higher
        H4-3 (+) - H4-4 (TWR+) Always Below 1 Ω
        H4-1 (-) - H4-2 (TWR-) Always Below 1 Ω
        H4-4 (TWR+) - H4-2 (TWR-) Always 10 kΩ or higher

    NG

    REPLACE FRONT NO. 2 SPEAKER Click here

    OK

  4. REPLACE FRONT NO. 2 SPEAKER


    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 speakers 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 Click here

    OK

    END (FRONT NO. 2 SPEAKER WAS DEFECTIVE)

  5. INSPECT REAR SPEAKER


    1. A003S4HE97
      Text in Illustration
      *a

      Component without harness connected

      (Rear Speaker)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K4-1 - K4-2 Always 3.2 to 4.8 Ω
        J4-1 - J4-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE REAR SPEAKER Click here

    OK

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