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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.
    2. w/ Front Center Speaker

      Measure the resistance between the front stereo component speaker and the stereo component amplifier to check for an open and short circuit in the wire harness

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P28-3 (CTR+) - K2-1 Always Below 1 Ω
      P28-9 (CTR-) - K2-2 Always Below 1 Ω
      P28-3 (CTR+) - Body ground Always 10 kΩ or higher
      P28-9 (CTR-) - Body ground Always 10 kΩ or higher
    3. Measure the resistance between each of the front No. 3 speakers and the stereo component amplifier to check for an open and short circuit in the wire harness.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P29-2 (FL+) - M4-1 (TWL+) Always Below 1 Ω
      P29-6 (FL-) - M4-3 (TWL-) Always Below 1 Ω
      P29-8 (FR+) - L2-1 (TWR+) Always Below 1 Ω
      P29-7 (FR-) - L2-3 (TWR-) Always Below 1 Ω
      P29-2 (FL+) - Body ground Always 10 kΩ or higher
      P29-6 (FL-) - Body ground Always 10 kΩ or higher
      P29-8 (FR+) - Body ground Always 10 kΩ or higher
      P29-7 (FR-) - Body ground Always 10 kΩ or higher
    4. Measure the resistance between each of the front No. 2 speakers and the front No. 3 speakers to check for an open and short circuit in the wire harness.
      Fig 1: Identifying Stereo Component Amplifier And Speakers Connectors
      G05753348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      M12-1 - M4-2 (+) Always Below 1 Ω
      M12-2 - M4-4 (-) Always Below 1 Ω
      L5-1 - L2-2 (+) Always Below 1 Ω
      L5-2 - L2-4 (-) Always Below 1 Ω
      M12-1 - Body ground Always 10 kΩ or higher
      M12-2- Body ground Always 10 kΩ or higher
      L5-1 - Body ground Always 10 kΩ or higher
      L5-2 - Body ground Always 10 kΩ or higher
    5. w/o Front Center Speaker

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P29-3 (RL+) - O3-1 Always Below 1 Ω
      P29-9 (RL-) - O3-2 Always Below 1 Ω
      P29-4 (RR+) - N3-1 Always Below 1 Ω
      P29-10 (RR-) - N3-2 Always Below 1 Ω
      P29-3 (RL+) - Body ground Always 10 kΩ or higher
      P29-9 (RL-) - Body ground Always 10 kΩ or higher
      P29-4 (RR+) - Body ground Always 10 kΩ or higher
      P29-10 (RR-) - Body ground Always 10 kΩ or higher
    6. w/ Front Center Speaker

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P29-3 (RL+) - O5-1 (+) Always Below 1 Ω
      P29-9 (RL-) - O5-3 (-) Always Below 1 Ω
      P29-4 (RR+) - N5-1 (+) Always Below 1 Ω
      P29-10 (RR-) - N5-3 (-) Always Below 1 Ω
      P29-3 (RL+) - Body ground Always 10 kΩ or higher
      P29-9 (RL-) - Body ground Always 10 kΩ or higher
      P29-4 (RR+) - Body ground Always 10 kΩ or higher
      P29-10 (RR-) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying Front Center Speaker And Woofer Box Speaker Connectors
      G05753349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. w/o Front Center Speaker

      Measure the resistance between each of the rear No. 3 speakers and the stereo component amplifier to check for an open and short circuit in the wire harness.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P28-8 (ML+) - O4-1 (+) Always Below 1 Ω
      P28-7 (ML-) - O4-3 (-) Always Below 1 Ω
      P28-3 (MR+) - N4-1 (+) Always Below 1 Ω
      P28-9 (MR-) - N4-3 (-) Always Below 1 Ω
      P28-8 (ML+) - Body ground Always 10 kΩ or higher
      P28-7 (ML-) - Body ground Always 10 kΩ or higher
      P28-3 (MR+) - Body ground Always 10 kΩ or higher
      P28-9 (MR-) - Body ground Always 10 kΩ or higher
    8. w/o Front Center Speaker

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      O6-1 - O4-2 (+TW) Always Below 1 Ω
      O6-2 - O4-4 (-TW) Always Below 1 Ω
      N6-1 - N4-2 (+TW) Always Below 1 Ω
      N6-2 - N4-4 (-TW) Always Below 1 Ω
      O6-1 - Body ground Always 10 kΩ or higher
      O6-2 - Body ground Always 10 kΩ or higher
      N6-1 - Body ground Always 10 kΩ or higher
      N6-2 - Body ground Always 10 kΩ or higher
    9. w/ Front Center Speaker

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      O2-1 - O5-2 (+TW) Always Below 1 Ω
      O2-2 - O5-4 (-TW) Always Below 1 Ω
      N2-1 - N5-2 (+TW) Always Below 1 Ω
      N2-2 - N5-4 (-TW) Always Below 1 Ω
      O2-1 - Body ground Always 10 kΩ or higher
      O2-2 - Body ground Always 10 kΩ or higher
      N2-1 - Body ground Always 10 kΩ or higher
      N2-2 - Body ground Always 10 kΩ or higher
    10. w/ Front Center Speaker

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P28-8 (SL+) - Q22-1 Always Below 1 Ω
      P28-7 (SL-) - Q22-2 Always Below 1 Ω
      P28-2 (SR+) - Q26-1 Always Below 1 Ω
      P28-6 (SR-) - Q26-2 Always Below 1 Ω
      P28-8 (SL+) - Body ground Always 10 kΩ or higher
      P28-7 (SL-) - Body ground Always 10 kΩ or higher
      P28-2 (SR+) - Body ground Always 10 kΩ or higher
      P28-6 (SR-) - Body ground Always 10 kΩ or higher
    11. Measure the resistance between each of the front No. 1 speakers and the stereo component amplifier to check for an open and short circuit in the wire harness

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P28-4 (WFL+) - M13-1 Always Below 1 Ω
      P28-10 (WFL-) - M13-2 Always Below 1 Ω
      P29-1 (WFR+) - L1-1 Always Below 1 Ω
      P29-5 (WFR-) - L1-2 Always Below 1 Ω
      P28-4 (WFL+) - Body ground Always 10 kΩ or higher
      P28-10 (WFL-) - Body ground Always 10 kΩ or higher
      P29-1 (WFR+) - Body ground Always 10 kΩ or higher
      P29-5 (WFR-) - Body ground Always 10 kΩ or higher
    12. w/ Front Center Speaker

      Measure the resistance between the woofer box speaker and the stereo component amplifier to check for an open and short circuit in the wire harness.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P28-1 (WF1+) - P21-3 (WF1+) Always Below 1 Ω
      P28-5 (WF1-) - P21-4 (WF1-) Always Below 1 Ω
      P28-1 (WF1+) - Body ground Always 10 kΩ or higher
      P28-5 (WF1-) - Body ground Always 10 kΩ or higher
    13. w/o Front Center Speaker

      Measure the resistance between the woofer box speaker and the stereo component amplifier to check for an open and short circuit in the wire harness.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      P28-1 (WF1+) - P21-1 (WF1+) Always Below 1 Ω
      P28-5 (WF1-) - P21-3 (WF1-) Always Below 1 Ω
      P28-2 (WF2+) - P21-2 (WF2+) Always Below 1 Ω
      P28-6 (WF2-) - P21-4 (WF2-) Always Below 1 Ω
      P28-1 (WF1+) - Body ground Always 10 kΩ or higher
      P28-5 (WF1-) - Body ground Always 10 kΩ or higher
      P28-2 (WF2+) - Body ground Always 10 kΩ or higher
      P28-6 (WF2-) - Body ground Always 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 according to the value(s) in the table below.

        Standard Resistance 

        w/ Front Center Speaker 

        RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        M13-1 - M13-2 Always 6 to 10 Ω
        L1-1 - L1-2 Always 6 to 10 Ω

        w/o Front Center Speaker 

        RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        M13-1 - M13-2 Always 3.2 to 4.8 Ω
        L1-1 - L1-2 Always 3 2 to 4 8 Ω
      2. Fig 3: Identifying Front No. 1 Speaker Connectors
      G05753350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FRONT NO. 1 SPEAKER  (See REMOVAL  )

    OK: Go to next step 

  3. INSPECT FRONT NO. 2 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 No. 2 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.

    NG: Go to step 4 

    OK: REPLACE FRONT NO. 2 SPEAKER  (See REMOVAL  )

  4. INSPECT FRONT NO. 3 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 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.

    NG: Go to step 5 

    OK: REPLACE FRONT NO. 3 SPEAKER  (See REMOVAL  )

  5. INSPECT REAR NO. 2 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 rear No. 2 speakers
      • When there is a possibility that either the right or left rear speaker is defective, inspect by interchanging the right one with the left one
      • Perform the above inspection on both LH and RH sides.

    NG: Go to step 6 

    OK: REPLACE REAR NO. 2 SPEAKER  (See REMOVAL  )

  6. CONFIRM MODEL 

    Result 

    RESULT REFERENCE

    Result Proceed to
    w/ Front Center Speaker A
    w/o Front Center Speaker B

    B: Go to step  11

    A: Go to next step 

  7. INSPECT REAR 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 rear speakers
      • When there is a possibility that either the right or left rear speaker is defective, inspect by interchanging the right one with the left one
      • Perform the above inspection on both LH and RH sides.

    NG: Go to step 8 

    OK: REPLACE REAR SPEAKER  (See REMOVAL  )

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

      OK: Malfunction disappears. 

      HINT

      • Connect all the connectors to the rear stereo component speakers.
      • When there is a possibility that either the right or left rear speaker is defective, inspect by interchanging the right one with the left one
      • Perform the above inspection on both LH and RH sides.

    NG: Go to step 9 

    OK: REPLACE REAR STEREO COMPONENT SPEAKER  (See REMOVAL  )

  9. INSPECT FRONT STEREO COMPONENT SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below

        Standard Resistance 

        RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        K2-1 - K2-2 Always 7 to 9 Ω
      2. Fig 4: Identifying Front Stereo Component Speaker Connectors
      G05753351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FRONT STEREO COMPONENT SPEAKER  (See REMOVAL  )

    OK: Go to next step 

  10. INSPECT WOOFER BOX SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below
        NOTE: The speaker should not be removed for checking.

        Standard Resistance 

        RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        P21-3 (WF1+) - P21-4 (WF1-) Always 7 to 8.6 Ω
      2. Fig 5: Identifying Woofer Box Speaker Connectors
      G05753352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE WOOFER BOX SPEAKER  (See REMOVAL  )

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

  11. INSPECT REAR NO. 3 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 rear No. 3 speakers.
      • When there is a possibility that either the right or left rear No. 3 speaker is defective, inspect by interchanging the right one with the left one.
      • Perform the above inspection of both LH and RH sides.

    NG: Go to step 12 

    OK: REPLACE REAR NO. 3 SPEAKER  (See REMOVAL  )

  12. INSPECT REAR SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        O3-1 - O3-2 Always 3.2 to 4.8 Ω
        N3-1 - N3-2 Always 3.2 to 4 8 Ω
      2. Fig 6: Identifying Rear Speaker Connectors
      G05753353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE REAR SPEAKER  (See REMOVAL  )

    OK: Go to next step 

  13. INSPECT WOOFER BOX SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below.
        NOTE: The speaker should not be removed for checking.

        Standard Resistance 

        RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        P21-1 (WF1+) - P21-3 (WF1-) Always 1.6 to 2.4 Ω
        P21-2 (WF2+) - P21-4 (WF2-) Always 1.6 to 2.4 Ω
      2. Fig 7: Identifying Woofer Box Speaker Connectors
      G05753354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE WOOFER BOX SPEAKER  (See REMOVAL  )

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

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