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

DTC Code DTC Name
74-40 Short in Speaker Circuit

DESCRIPTION

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

This circuit has a fail-safe function.

When a short in the speaker circuit is detected, all sound outputs are stopped.

WIRING DIAGRAM

A01ND5XE01
A01NGCIE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. A01NFZTE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stereo Component Amplifier Assembly)
      *2

      Front view of wire harness connector

      (to Stereo Component Amplifier Assembly)
      *3

      Front view of wire harness connector

      (to Front No. 2 Speaker)
      *4

      Front view of wire harness connector

      (to Front No. 3 speaker, Front No. 4 Speaker)
      *5

      Front view of wire harness connector

      (to Front No. 1 Speaker, Rear No. 1 Speaker)

      Disconnect the connectors shown in the illustration 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
      Tester Connection Condition Specified Condition
      O34-1 (FL+) - J4-1 (TWL+) Always Below 1 Ω
      O34-5 (FL-) - J4-2 (TWL-) Always Below 1 Ω
      O34-2 (FR+) - I5-1 (TWR+) Always Below 1 Ω
      O34-6 (FR-) - I5-2 (TWR-) 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
      O16-3 (WFL+) - J2-1 Always Below 1 Ω
      O16-8 (WFL-) - J2-2 Always Below 1 Ω
      O16-10 (WFR+) - I3-1 Always Below 1 Ω
      O16-9 (WFR-) - I3-2 Always Below 1 Ω

    4. 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
      O34-8 (CTR+) - H2-2 Always Below 1 Ω
      O34-7 (CTR-) - H2-1 Always Below 1 Ω

    5. Measure the resistance between each of the rear 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
      O16-4 (RL+) - L4-1 Always Below 1 Ω
      O16-11 (RL-) - L4-2 Always Below 1 Ω
      O16-5 (RR+) - K4-1 Always Below 1 Ω
      O16-12 (RR-) - K4-2 Always Below 1 Ω

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J4-3 (+) - J6-2 Always Below 1 Ω
      J4-4 (-) - J6-1 Always Below 1 Ω
      I5-3 (+) - I6-2 Always Below 1 Ω
      I5-4 (-) - I6-1 Always Below 1 Ω

    7. 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
      O16-3 (WFL+) - Body ground Always 10 kΩ or higher
      O16-8 (WFL-) - Body ground Always 10 kΩ or higher
      O16-10 (WFR+) - Body ground Always 10 kΩ or higher
      O16-9 (WFR-) - Body ground Always 10 kΩ or higher
      O16-4 (RL+) - Body ground Always 10 kΩ or higher
      O16-11 (RL-) - Body ground Always 10 kΩ or higher
      O16-5 (RR+) - Body ground Always 10 kΩ or higher
      O16-12 (RR-) - Body ground Always 10 kΩ or higher
      O34-1 (FL+) - Body ground Always 10 kΩ or higher
      O34-5 (FL-) - Body ground Always 10 kΩ or higher
      O34-2 (FR+) - Body ground Always 10 kΩ or higher
      O34-6 (FR-) - Body ground Always 10 kΩ or higher
      O34-8 (CTR+) - Body ground Always 10 kΩ or higher
      O34-7 (CTR-) - Body ground Always 10 kΩ or higher

    8. Measure the resistance between front No. 2 speaker and body ground to check for a short circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I5-3 (+) - Body ground Always 10 kΩ or higher
      I5-4 (-) - Body ground Always 10 kΩ or higher
      J4-3 (+) - Body ground Always 10 kΩ or higher
      J4-4 (-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT FRONT NO. 1 SPEAKER


    1. A01NDQME24
      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
        J2-1 - J2-2 Always 3.2 to 4.8 Ω
        I3-1 - I3-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 1 SPEAKER Click here

    OK

  3. INSPECT 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 FRONT NO. 3 SPEAKER Click here

    OK

    END (FRONT NO. 2 SPEAKER WAS DEFECTIVE)

  4. INSPECT FRONT NO. 3 SPEAKER


    1. A01NHCNE06
      Text in Illustration
      *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
        J6-1 - J6-2 Always 3.2 to 4.8 Ω
        I6-1 - I6-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 3 SPEAKER Click here

    OK

  5. INSPECT REAR NO. 1 SPEAKER


    1. A01NDQME25
      Text in Illustration
      *1

      Component without harness connected

      (Rear 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
        L4-1 - L4-2 Always 3.2 to 4.8 Ω
        K4-1 - K4-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE REAR NO. 1 SPEAKER Click here

    OK

  6. INSPECT FRONT NO. 4 SPEAKER


    1. A01NHCNE07
      Text in Illustration
      *1

      Component without harness connected

      (Front No. 4 Speaker)

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        H2-1 - H2-2 Always 4.8 to 7.2 Ω

    NG

    REPLACE FRONT NO. 4 SPEAKER Click here

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here