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

DTC Code DTC Name
74-40 Short in Speaker Circuit

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

74-40

Short in Speaker Circuit

A short is detected in the speaker output circuit.

  • Harness or connector

  • Speaker

  • Stereo component amplifier assembly

WIRING DIAGRAM

E199615E06

CAUTION / NOTICE / HINT

Tip:

After the inspection is completed, clear the DTCs.

PROCEDURE

  1. CHECK FOR DTC

    1. Disconnect the H7 and H11 stereo component amplifier assembly connectors.

    2. Clear the DTC.

    3. Check if DTC 74-40 is output.

      OK

      No DTC is output.

      Result

      Result

      OK

      NG
    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

    Click here

    OK

  2. CHECK FOR DTC

    1. Reconnect the H11 stereo component amplifier assembly connector.

    2. Check if DTC 74-40 is output.

      OK

      No DTC is output.

      Result

      Result

      OK

      NG
    NG

    CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - SPEAKER)Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - SPEAKER)

    1. Disconnect the H7 stereo component amplifier assembly connector.

    2. Disconnect the H20*1 and/or H21*2 front No. 3 speaker assembly connector.

      • *1: for RH

      • *2: for LH

    3. Disconnect the H13 front No. 4 speaker assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H7-1 (FL+) - H21-1 (TWL+)

      Always

      Below 1 Ω

      H7-2 (FR+) - H20-1 (TWR+)

      Always

      Below 1 Ω

      H7-5 (FL-) - H21-2 (TWL-)

      Always

      Below 1 Ω

      H7-6 (FR-) - H20-2 (TWR-)

      Always

      Below 1 Ω

      H7-7 (CTR-) - H13-1

      Always

      Below 1 Ω

      H7-8 (CTR+) - H13-2

      Always

      Below 1 Ω

      H7-1 (FL+) - Body ground

      Always

      10 kΩ or higher

      H7-2 (FR+) - Body ground

      Always

      10 kΩ or higher

      H7-5 (FL-) - Body ground

      Always

      10 kΩ or higher

      H7-6 (FR-) - Body ground

      Always

      10 kΩ or higher

      H7-7 (CTR-) - Body ground

      Always

      10 kΩ or higher

      H7-8 (CTR+) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FRONT NO. 3 SPEAKER ASSEMBLY RH

    1. E199616N02

      Disconnect the H20 front No. 3 speaker assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (TWR+) - 3 (+)

      Always

      Below 1 Ω

      2 (TWR-) - 4 (-)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE FRONT NO. 3 SPEAKER ASSEMBLY RH

    Click here

    OK

  5. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY RH

    1. E199617

      Disconnect the H9 front No. 1 speaker assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      4.0 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY RH

    Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT NO. 3 SPEAKER RH - FRONT NO. 1 SPEAKER RH)

    1. Disconnect the H20 front No. 3 speaker assembly RH connector.

    2. Disconnect the H9 front No. 1 speaker assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H20-3 (+) - H9-2

      Always

      Below 1 Ω

      H20-4 (-) - H9-1

      Always

      Below 1 Ω

      H20-3 (+) - Body ground

      Always

      10 kΩ or higher

      H20-4 (-) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE FRONT NO. 3 SPEAKER ASSEMBLY RH

    1. Temporarily replace the front No. 3 speaker assembly RH with a new or normally functioning one.

      Click here

      OK

      Malfunction disappears.

      Result

      Result

      OK

      NG
    OK

    END (FRONT NO. 3 SPEAKER ASSEMBLY RH IS DEFECTIVE)

    NG

  8. INSPECT FRONT NO. 3 SPEAKER ASSEMBLY LH

    1. E199616N01

      Disconnect the H21 front No. 3 speaker assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (TWL+) - 3 (+)

      Always

      Below 1 Ω

      2 (TWL-) - 4 (-)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE FRONT NO. 3 SPEAKER ASSEMBLY LH

    Click here

    OK

  9. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY LH

    1. E199617

      Disconnect the H12 front No. 1 speaker assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      4.0 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY LH

    Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (FRONT NO. 3 SPEAKER LH - FRONT NO. 1 SPEAKER LH)

    1. Disconnect the H21 front No. 3 speaker assembly LH connector.

    2. Disconnect the H12 front No. 1 speaker assembly LH connector

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H21-3 (+) - H12-2

      Always

      Below 1 Ω

      H21-4 (-) - H12-1

      Always

      Below 1 Ω

      H21-3 (+) - Body ground

      Always

      10 kΩ or higher

      H21-4 (-) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REPLACE FRONT NO. 3 SPEAKER ASSEMBLY LH

    1. Temporarily replace the front No. 3 speaker assembly LH with a new or normally functioning one.

      Click here

      OK

      Malfunction disappears.

      Result

      Result

      OK

      NG
    OK

    END (FRONT NO. 3 SPEAKER ASSEMBLY LH IS DEFECTIVE)

    NG

  12. INSPECT FRONT NO. 4 SPEAKER ASSEMBLY

    1. E199617

      Disconnect the H13 front No. 4 speaker assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      6.0 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

    Click here

    NG

    REPLACE FRONT NO. 4 SPEAKER ASSEMBLY

    Click here

  13. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - SPEAKER)

    • *1: for RH

    • *2: for LH

    1. Disconnect the H11 stereo component amplifier assembly connector.

    2. Disconnect the J3*1 and/or K2*2 front No. 2 speaker assembly connector.

    3. Disconnect the L1*1 and/or M1*2 rear No. 1 speaker assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H11-3 (WFL+) - K2-1

      Always

      Below 1 Ω

      H11-4 (RL+) - M1-1

      Always

      Below 1 Ω

      H11-5 (RR+) - L1-1

      Always

      Below 1 Ω

      H11-8 (WFL-) - K2-2

      Always

      Below 1 Ω

      H11-9 (WFR-) - J3-2

      Always

      Below 1 Ω

      H11-10 (WFR+) - J3-1

      Always

      Below 1 Ω

      H11-11 (RL-) - M1-2

      Always

      Below 1 Ω

      H11-12 (RR-) - L1-2

      Always

      Below 1 Ω

      H11-3 (WFL+) - Body ground

      Always

      10 kΩ or higher

      H11-4 (RL+) - Body ground

      Always

      10 kΩ or higher

      H11-5 (RR+) - Body ground

      Always

      10 kΩ or higher

      H11-8 (WFL-) - Body ground

      Always

      10 kΩ or higher

      H11-9 (WFR-) - Body ground

      Always

      10 kΩ or higher

      H11-10 (WFR+) - Body ground

      Always

      10 kΩ or higher

      H11-11 (RL-) - Body ground

      Always

      10 kΩ or higher

      H11-12 (RR-) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY RH

    1. E144966

      Disconnect the J3 front No. 2 speaker assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      4.0 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY RH

    Click here

    OK

  15. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY LH

    1. E144966

      Disconnect the K2 front No. 2 speaker assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      4.0 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY LH

    Click here

    OK

  16. INSPECT REAR NO. 1 SPEAKER ASSEMBLY RH

    1. E144966

      Disconnect the L1 rear No. 1 speaker assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      4.0 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE REAR NO. 1 SPEAKER ASSEMBLY RH

    Click here

    OK

  17. INSPECT REAR NO. 1 SPEAKER ASSEMBLY LH

    1. E144966

      Disconnect the M1 rear No. 1 speaker assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      4.0 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

    Click here

    NG

    REPLACE REAR NO. 1 SPEAKER ASSEMBLY LH

    Click here