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Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the connectors from the stereo component amplifier and speakers.
    2. Measure the resistance between each of the front No. 1 speakers and the stereo component amplifier to check for an open circuit in the wire harness.

      Standard resistance: 

      Below 1 Ω 

    3. Measure the resistance between each of the front No. 2 speakers (except the center speaker) and the front stereo component speaker to check for an open circuit in the wire harness.

      Standard resistance: 

      Below 1 Ω 

    4. Measure the resistance between each of the front stereo component speakers and the stereo component amplifier to check for an open circuit in the wire harness.

      Standard resistance: 

      Below 1 Ω 

    5. with Front Center Speaker:

      Measure the resistance between the front No. 2 speaker (center speaker) and the stereo component amplifier to check for an open circuit in the wire harness.

      Standard resistance: 

      Below 1 Ω 

    6. Measure the resistance between each of the rear speakers and the stereo component amplifier to check for an open circuit in the wire harness.
      Fig 1: Identifying Stereo Component Amplifier Connector Terminals
      G05270602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance: 

      Below 1 Ω 

    7. Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.
      Fig 2: Identifying Speaker Connector Terminals
      G05270603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance: 

      10 kΩ or higher 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next step 

  2. INSPECT FRONT NO. 1 SPEAKER 
    1. Resistance check
      1. Measure the resistance between the terminals of the speaker.

        Standard resistance: 

        with Front Center Speaker: 

        7 to 9 Ω 

        without Front Center Speaker: 

        Approximately 2 Ω 

        HINT:

        Perform the above inspection on both LH and RH sides.

    NG: REPLACE FRONT NO. 1 SPEAKER 

    OK: Go to Next step 

  3. INSPECT FRONT NO. 2 SPEAKER 
    1. Resistance check
      1. Measure the resistance between the terminals of the speaker.

        Standard resistance: 

        with Front Center Speaker: 

        7 to 9 Ω 

        without Front Center Speaker: 

        Approximately 4 Ω 

        HINT:

        Perform the above inspection on both LH and RH sides.

    NG: REPLACE FRONT NO. 2 SPEAKER 

    OK: Go to Next step 

  4. INSPECT FRONT STEREO COMPONENT SPEAKER 
    1. Check that the malfunction disappears when another speaker in good condition is installed.

      Standard: 

      Malfunction disappears. 

      HINT:

      • Connect all the connectors to the front stereo component speakers.
      • 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.

    OK: REPLACE FRONT STEREO COMPONENT SPEAKER 

    NG: Go to Next step 

  5. INSPECT REAR SPEAKER 
    1. Resistance check
      1. Measure the resistance between the terminals of the speakers.

        Standard resistance: 

        with Front Center Speaker: 

        14 to 18 Ω 

        without Front Center Speaker: 

        Approximately 4 Ω 

        HINT:

        Perform the above inspection on both LH and RH sides.

    NG: REPLACE REAR SPEAKER 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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