AUDIO AND VISUAL SYSTEM (w/o Navigation System), Diagnostic DTC:74-40

DTC Code DTC Name
74-40 Short in Speaker Circuit

DESCRIPTION

This DTC is stored when a malfunction occurs in the speakers.

DTC No. DTC Detection Condition Trouble Area
74-40 A short is detected in the speaker output circuit.

  • Wire harness or connector

  • Speaker

  • Stereo component amplifier assembly

WIRING DIAGRAM

A0161P2E01
A0160P9E01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. Disconnect stereo component amplifier assembly connectors P44 and P28.

    2. Clear the DTCs and recheck for DTCs.

    3. Check if DTC 74-40 is output.

      OK
      DTC 74-40 is not output.

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    OK

  2. CHECK OPERATION


    1. Reconnect stereo component amplifier assembly connector P28.

    2. Check if DTC 74-40 is output.

      OK
      DTC 74-40 is not output.

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR


    1. Disconnect stereo component amplifier assembly connector P44 and speaker connectors L1, M13, N4, N6, O4, O6, N3 and O3.

    2. 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
      P44-10 (WFR+) - Body ground Always 10 kΩ or higher
      P44-9 (WFR-) - Body ground Always 10 kΩ or higher
      P44-3 (WFL+) - Body ground Always 10 kΩ or higher
      P44-8 (WFL-) - Body ground Always 10 kΩ or higher
      P44-2 (MR+) - Body ground Always 10 kΩ or higher
      P44-7 (MR-) - Body ground Always 10 kΩ or higher
      P44-1 (ML+) - Body ground Always 10 kΩ or higher
      P44-6 (ML-) - Body ground Always 10 kΩ or higher
      P44-5 (RR+) - Body ground Always 10 kΩ or higher
      P44-12 (RR-) - Body ground Always 10 kΩ or higher
      P44-4 (RL+) - Body ground Always 10 kΩ or higher
      P44-11 (RL-) - Body ground Always 10 kΩ or higher

    3. 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
      N6-1 - Body ground Always 10 kΩ or higher
      N6-2 - Body ground Always 10 kΩ or higher
      O6-1 - Body ground Always 10 kΩ or higher
      O6-2 - Body ground Always 10 kΩ or higher

    4. 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
      P44-10 (WFR+) - L1-1 Always Below 1 Ω
      P44-9 (WFR-) - L1-2 Always Below 1 Ω
      P44-3 (WFL+) - M13-1 Always Below 1 Ω
      P44-8 (WFL-) - M13-2 Always Below 1 Ω

    5. 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
      P44-5 (RR+) - N3-1 Always Below 1 Ω
      P44-12 (RR-) - N3-2 Always Below 1 Ω
      P44-4 (RL+) - O3-1 Always Below 1 Ω
      P44-11 (RL-) - O3-2 Always Below 1 Ω

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P44-2 (MR+) - N4-1 (+) Always Below 1 Ω
      P44-7 (MR-) - N4-3 (-) Always Below 1 Ω
      P44-1 (ML+) - O4-1 (+) Always Below 1 Ω
      P44-6 (ML-) - O4-3 (-) Always Below 1 Ω

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N4-2 (+TW) - N6-1 Always Below 1 Ω
      N4-4 (-TW) - N6-2 Always Below 1 Ω
      O4-2 (+TW) - O6-1 Always Below 1 Ω
      O4-4 (-TW) - O6-2 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FRONT NO. 1 SPEAKER


    1. A0161OXE49
      Text in Illustration
      *1

      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
        L1-1 - L1-2 Always 3.2 to 4.8 Ω
        M13-1 - M13-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 1 SPEAKER Click here

    OK

  5. INSPECT REAR SPEAKER


    1. A0161OXE50
      Text in Illustration
      *1

      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
        N3-1 - N3-2 Always 3.2 to 4.8 Ω
        O3-1 - O3-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE REAR SPEAKER Click here

    OK

  6. INSPECT REAR NO. 2 SPEAKER


    1. A0161JPE10
      Text in Illustration
      *1

      Component without harness connected

      (Rear 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
        N6-1 - N6-2 Always 3.2 to 4.8 Ω
        O6-1 - O6-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE REAR NO. 2 SPEAKER Click here

    OK

  7. INSPECT REAR NO. 3 SPEAKER


    1. A01610CE17
      Text in Illustration
      *1

      Component without harness connected

      (Rear No. 3 Speaker)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        N4-1 (+) - N4-3 (-) Always 3.2 to 4.8 Ω
        O4-1 (+) - O4-3 (-) Always 3.2 to 4.8 Ω

    NG

    REPLACE REAR NO. 3 SPEAKER Click here

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR


    1. Disconnect stereo component amplifier assembly connector P28 and speaker connectors M12, M4, L5, L2 and P21.

    2. 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
      P28-4 (FR+) - Body ground Always 10 kΩ or higher
      P28-10 (FR-) - Body ground Always 10 kΩ or higher
      P28-3 (FL+) - Body ground Always 10 kΩ or higher
      P28-9 (FL-) - Body ground Always 10 kΩ or higher
      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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L5-1 - Body ground Always 10 kΩ or higher
      L5-2 - Body ground Always 10 kΩ or higher
      M12-1 - Body ground Always 10 kΩ or higher
      M12-2 - Body ground Always 10 kΩ or higher

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P28-4 (FR+) - L2-1 (TWR+) Always Below 1 Ω
      P28-10 (FR-) - L2-3 (TWR-) Always Below 1 Ω
      P28-3 (FL+) - M4-1 (TWL+) Always Below 1 Ω
      P28-9 (FL-) - M4-3 (TWL-) Always Below 1 Ω

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L2-2 (+) - L5-1 Always Below 1 Ω
      L2-4 (-) - L5-2 Always Below 1 Ω
      M4-2 (+) - M12-1 Always Below 1 Ω
      M4-4 (-) - M12-2 Always Below 1 Ω

    6. 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 (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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT FRONT NO. 2 SPEAKER


    1. A0161JPE11
      Text in Illustration
      *1

      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
        L5-1 - L5-2 Always 3.2 to 4.8 Ω
        M12-1 - M12-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 2 SPEAKER Click here

    OK

  10. INSPECT FRONT NO. 3 SPEAKER


    1. A01610CE18
      Text in Illustration
      *A for RH
      *B for LH
      *1

      Component without harness connected

      (Front No. 3 Speaker)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L2-1 (TWR+) - L2-3 (TWR-) Always 3.2 to 4.8 Ω
        M4-1 (TWL+) - M4-3 (TWL-) Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 3 SPEAKER Click here

    OK

  11. INSPECT STEREO COMPONENT SPEAKER


    1. A01610CE13
      Text in Illustration
      *1

      Component without harness connected

      (Stereo Component Speaker)

      Resistance check


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

        Standard Resistance
        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

    NG

    REPLACE STEREO COMPONENT SPEAKER Click here

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here