LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2012 >> IS 250C Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Audio / Video System (W/O Navigation) (Multi-Display) (Diagnostic Codes & Symptom Tests) >> AUDIO AND VISUAL SYSTEM (w/o Navigation System with Multi-display) >> Symptom Tests >> Speaker Circuit >> Procedure

Speaker Circuit: Procedure

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

      Tester Connection Condition Specified Condition
      P28-3 (FL+) - M12-1 (+) Always Below 1 Ω
      P28-9 (FL-) - M12-2 (-) Always Below 1 Ω
      P28-4 (FR+) - L5-1 (+) Always Below 1 Ω
      P28-10 (FR-) - L5-2 (-) Always Below 1 Ω
      STANDARD RESISTANCE W/O FRONT CENTER SPEAKER

      Tester Connection Condition Specified Condition
      P28-1 (FL+) - M12-1 (+) Always Below 1 Ω
      P28-5 (FL-) - M12-2 (-) Always Below 1 Ω
      P28-2 (FR+) - L5-1 (+) Always Below 1 Ω
      P28-6 (FR-) - L5-2 (-) Always Below 1 Ω
    3. Measure the resistance between each of the front No. 1 speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      P51-3 (WFL+) - M13-1 Always Below 1 Ω
      P51-8 (WFL-) - M13-2 Always Below 1 Ω
      P51-10 (WFR+) - L1-1 Always Below 1 Ω
      P51-9 (WFR-) - L1-2 Always Below 1 Ω
    4. w/o Front Center Speaker:

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

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      P51-4 (RL+) - Q21-1 Always Below 1 Ω
      P51-11 (RL-) - Q21-2 Always Below 1 Ω
      P51-5 (RR+) - P46-1 Always Below 1 Ω
      P51-12 (RR-) - P46-2 Always Below 1 Ω
    5. w/ Front Center Speaker:

      Measure the resistance between the front No. 4 speaker and the stereo component amplifier assembly to check for an open circuit in the wire harness.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P28-8 (CTR+) - K2-1 Always Below 1 Ω
      P28-7 (CTR-) - K2-2 Always Below 1 Ω
    6. w/ Front Center Speaker:

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      P51-4 (RL+) - Q20-1 (+) Always Below 1 Ω
      P51-11 (RL-) - Q20-3 (-) Always Below 1 Ω
      P51-5 (RR+) - P45-1 (+) Always Below 1 Ω
      P51-12 (RR-) - P45-3 (-) Always Below 1 Ω
    7. w/ Front Center Speaker:

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

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      P28-1 (WF1+) - P21-1 Always Below 1 Ω
      P28-2 (WF2+) - P21-2 Always Below 1 Ω
    8. w/ Front Center Speaker:

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

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      Q20-2 (+TW) - Q21-1 Always Below 1 Ω
      Q20-4 (-TW) - Q21-2 Always Below 1 Ω
      P45-2 (+TW) - P46-1 Always Below 1 Ω
      P45-4 (-TW) - P46-2 Always Below 1 Ω
    9. Measure the resistance between the stereo component amplifier assembly and body ground to check for a short circuit in the wire harness.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      P51-3 (WFL+) - Body ground Always 10 kΩ or higher
      P51-8 (WFL-) - Body ground Always 10 kΩ or higher
      P51-10 (WFR+) - Body ground Always 10 kΩ or higher
      P51-9 (WFR-) - Body ground Always 10 kΩ or higher
      P51-4 (RL+) - Body ground Always 10 kΩ or higher
      P51-11 (RL-) - Body ground Always 10 kΩ or higher
      P51-5 (RR+) - Body ground Always 10 kΩ or higher
      P51-12 (RR-) - Body ground Always 10 kΩ or higher
      P28-1 (WF1+) - Body ground*1 Always 10 kΩ or higher
      P28-2 (WF2+) - Body ground*1 Always 10 kΩ or higher
      P28-4 (FR+) - Body ground*1 Always 10 kΩ or higher
      P28-10 (FR-) - Body ground*1 Always 10 kΩ or higher
      P28-3 (FL+) - Body ground*1 Always 10 kΩ or higher
      P28-9 (FL-) - Body ground*1 Always 10 kΩ or higher
      P28-8 (CTR+) - Body ground*1 Always 10 kΩ or higher
      P28-7 (CTR-) - Body ground*1 Always 10 kΩ or higher
      P28-1 (FL+) - Body ground*2 Always 10 kΩ or higher
      P28-5 (FL-) - Body ground*2 Always 10 kΩ or higher
      P28-2 (FR+) - Body ground*2 Always 10 kΩ or higher
      P28-6 (FR-) - Body ground*2 Always 10 kΩ or higher

      *1: w/ Front Center Speaker

      *2: w/o Front Center Speaker

    10. w/ Front Center Speaker:

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

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      Q20-2 (+TW) - Body ground Always 10 kΩ or higher
      Q20-4 (-TW) - Body ground Always 10 kΩ or higher
      P45-2 (+TW) - Body ground Always 10 kΩ or higher
      P45-4 (-TW) - 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
      Fig 1: L1 & M13 Connector Terminal Identification
      GTY393784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        W/O FRONT CENTER SPEAKER

        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
        W/ FRONT CENTER SPEAKER

        Tester Connection Condition Specified Condition
        M13-1 - M13-2 Always 5.0 to 8.5 Ω
        L1-1 - L1-2 Always 5.0 to 8.5 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Front No. 1 Speaker)

    NG → See step   15 

    OK: Go to next step 

  3. INSPECT REAR SPEAKER 
    1. Resistance check
      Fig 2: P46 & Q21 Connector Terminal Identification
      GTY393451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        W/O FRONT CENTER SPEAKER

        Tester Connection Condition Specified Condition
        Q21-1 - Q21-2 Always 3.2 to 4.8 Ω
        P46-1 - P46-2 Always 3.2 to 4.8 Ω
        W/ FRONT CENTER SPEAKER

        Tester Connection Condition Specified Condition
        Q21-1 - Q21-2 Always 5.0 to 7.0 Ω
        P46-1 - P46-2 Always 5.0 to 7.0 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Rear Speaker)

    NG → See step   18 

    OK: Go to next step 

  4. CONFIRM MODEL 
    1. Choose the model to be inspected.
      RESULT

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

    B → See step   8 

    A: Go to next step 

  5. INSPECT FRONT NO. 2 SPEAKER 
    1. Resistance check
      Fig 3: L5, L24, m12 & M12 Connector Terminal Identification
      GTY395270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.
        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        M12-1 (+) - M12-2 (-) Always 3.2 to 4.8 Ω
        M12-1 (+) - m12-1 (SQ+) Always Below 1 Ω
        M12-2 (-) - m12-3 (SQ-) Always Below 1 Ω
        L5-1 (+) - L5-2 (-) Always 3.2 to 4.8 Ω
        L5-1 (+) - L24-1 (SQ+) Always Below 1 Ω
        L5-2 (-) - L24-3 (SQ-) Always Below 1 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Front No. 2 Speaker)

    NG → See step   21 

    OK: Go to next step 

  6. INSPECT FRONT NO. 3 SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below.
        Fig 4: L24 & m12 Connector Terminal Identification
        GTY393200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        m12-1 (SQ+) - m12-3 (SQ-) Always 10 kΩ or higher
        L24-1 (SQ+) - L24-3 (SQ-) Always 10 kΩ or higher
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Front No. 3 Speaker)

    NG → See step   17 

    OK: Go to next step 

  7. REPLACE FRONT NO. 3 SPEAKER 
    1. Check that the malfunction disappears when a known good speaker is installed. Refer to REMOVAL .

      OK

      Malfunction disappears.

      HINT: 

      • Connect all the connectors to the front No. 3 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 → See step   20 

    OK → END (FRONT NO. 3 SPEAKER WAS DEFECTIVE) 

  8. INSPECT FRONT NO. 2 SPEAKER 
    1. Resistance check
      Fig 5: L5, L24, m12 & M12 Connector Terminal Identification
      GTY395270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      M12-1 (+) - M12-2 (-) Always 10 kΩ or higher
      M12-1 (+) - m12-1 (SQ+) Always Below 1 Ω
      M12-2 (-) - m12-3 (SQ-) Always Below 1 Ω
      L5-1 (+) - L5-2 (-) Always 10 kΩ or higher
      L5-1 (+) - L24-1 (SQ+) Always Below 1 Ω
      L5-2 (-) - L24-3 (SQ-) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Front No. 2 Speaker)

    NG → See step   21 

    OK: Go to next step 

  9. REPLACE FRONT NO. 2 SPEAKER 
    1. Check that the malfunction disappears when a known good speaker is installed. Refer to REMOVAL .

      OK

      Malfunction disappears.

      HINT: 

      • 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 → See step   10 

    OK → END (FRONT NO. 2 SPEAKER WAS DEFECTIVE) 

  10. INSPECT FRONT NO. 3 SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below.
        Fig 6: L24 & M12 Connector Terminal Identification
        GTY393200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        m12-1 (SQ+) - m12-3 (SQ-) Always 4.8 to 6.4 Ω
        L24-1 (SQ+) - L24-3 (SQ-) Always 4.8 to 6.4 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Front No. 3 Speaker)

    NG → See step   17 

    OK: Go to next step 

  11. INSPECT FRONT NO. 4 SPEAKER 
    1. Resistance check
      Fig 7: K2 Connector Terminal Identification
      GTY393801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.
        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        K2-1 - K2-2 Always 4.8 to 6.4 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Front No. 4 Speaker)

    NG → See step   16 

    OK: Go to next step 

  12. INSPECT REAR NO. 2 SPEAKER 
    1. Resistance check
      1. Measure the resistance according to the value(s) in the table below.
        Fig 8: P45 & Q20 Connector Terminal Identification
        GTY395395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        Q20-1 (+) - Q20-3 (-) Always 10 kΩ or higher
        Q20-1 (+) - Q20-2 (+TW) Always Below 1 Ω
        Q20-3 (-) - Q20-4 (-TW) Always Below 1 Ω
        P45-1 (+) - P45-3 (-) Always 10 kΩ or higher
        P45-1 (+) - P45-2 (+TW) Always Below 1 Ω
        P45-3 (-) - P45-4 (-TW) Always Below 1 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Rear No. 2 Speaker)

    NG → See step   22 

    OK: Go to next step 

  13. REPLACE REAR NO. 2 SPEAKER 
    1. Check that the malfunction disappears when a known good speaker is installed. Refer to REMOVAL .

      OK

      Malfunction disappears.

      HINT: 

      • Connect all the connectors to the rear 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 → See step   14 

    OK → END (REAR NO. 2 SPEAKER WAS DEFECTIVE) 

  14. INSPECT STEREO COMPONENT SPEAKER 
    1. Resistance check
      Fig 9: P21 Connector Terminal Identification
      GTY394182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.
        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        P21-1 (WF1+) - P21-2 (WF2+) Always 10 to 17 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Stereo Component Speaker)

    NG → See step   19 

    OK → See step   20 

  15. REPLACE FRONT NO. 1 SPEAKER. Refer to  REMOVAL 
  16. REPLACE FRONT NO. 4 SPEAKER. Refer to  REMOVAL 
  17. REPLACE FRONT NO. 3 SPEAKER. Refer to  REMOVAL 
  18. REPLACE REAR SPEAKER. Refer to  REMOVAL 
  19. REPLACE STEREO COMPONENT SPEAKER. Refer to  REMOVAL 
  20. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  21. REPLACE FRONT NO. 2 SPEAKER. Refer to  REMOVAL 
  22. REPLACE REAR NO. 2 SPEAKER. Refer to  REMOVAL 
scientia non olet · About LEMON Manuals