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

  • Speaker

  • Stereo component amplifier

This circuit has a fail-safe function.


WIRING DIAGRAM

A015ZD6E01
A0160V3E01
A015Z82E03

INSPECTION PROCEDURE

Tech Tips

After the inspection is completed, clear the DTCs.

PROCEDURE


  1. INSPECT STEREO COMPONENT AMPLIFIER


    1. Disconnect the stereo component amplifier connectors P29 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 Click here

    OK

  2. CHECK OPERATION


    1. Reconnect the stereo component amplifier connector P29.

    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. A0161FBE01

      Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.

    2. A015ZMHE09

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P28-3 (CTR+) - Body ground*1 Always 10 kΩ or higher
      P28-9 (CTR-) - Body ground*1 Always 10 kΩ or higher
      P28-8 (ML+) - Body ground*2 Always 10 kΩ or higher
      P28-7 (ML-) - Body ground*2 Always 10 kΩ or higher
      O4-2 (+TW) - Body ground*2 Always 10 kΩ or higher
      O4-4 (-TW) - Body ground*2 Always 10 kΩ or higher
      P28-3 (MR+) - Body ground*2 Always 10 kΩ or higher
      P28-9 (MR-) - Body ground*2 Always 10 kΩ or higher
      N4-2 (+TW) - Body ground*2 Always 10 kΩ or higher
      N4-4 (-TW) - Body ground*2 Always 10 kΩ or higher
      P28-8 (SL+) - Body ground*1 Always 10 kΩ or higher
      P28-7 (SL-) - Body ground*1 Always 10 kΩ or higher
      P28-2 (SR+) - Body ground*1 Always 10 kΩ or higher
      P28-6 (SR-) - Body ground*1 Always 10 kΩ or higher
      P28-4 (WFL+) - Body ground Always 10 kΩ or higher
      P28-10 (WFL-) - Body ground Always 10 kΩ or higher
      P28-2 (WF2+) - Body ground*2 Always 10 kΩ or higher
      P28-6 (WF2-) - Body ground*2 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

      *1: w/ Front Center Speaker

      *2: w/o Front Center Speaker


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FRONT NO. 1 SPEAKER (LEFT HAND)


    1. A0161OXE01

      Resistance check


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

        Standard Resistance
        w/ Front Center Speaker
        Tester Connection Condition Specified Condition
        M13-1 - M13-2 Always 6 to 10 Ω
        w/o Front Center Speaker
        Tester Connection Condition Specified Condition
        M13-1 - M13-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 1 SPEAKER (LEFT HAND) Click here

    OK

  5. CONFIRM MODEL

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

    B

    INSPECT REAR STEREO COMPONENT SPEAKER (LEFT HAND) Click here

    A

  6. INSPECT REAR NO. 2 SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.

    2. Check that sound from the audio system can be heard from the speaker.

      OK
      Sound from the audio system can be heard.

    NG

    REPLACE REAR NO. 2 SPEAKER (RIGHT HAND) Click here

    OK

  7. INSPECT REAR NO. 2 SPEAKER (LEFT HAND)


    1. Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.

    2. Check that sound from the audio system can be heard from the speaker.

      OK
      Sound from the audio system can be heard.

    NG

    REPLACE REAR NO. 2 SPEAKER (LEFT HAND) Click here

    OK

  8. INSPECT REAR NO. 3 SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and rear No. 3 speaker connector.

    2. Check that sound from the audio system can be heard from the speaker.

      OK
      Sound from the audio system can be heard.

    NG

    REPLACE REAR NO. 3 SPEAKER (RIGHT HAND) Click here

    OK

  9. INSPECT REAR NO. 3 SPEAKER (LEFT HAND)


    1. Reconnect the stereo component amplifier connector and rear No. 3 speaker connector.

    2. Check that sound from the audio system can be heard from the speaker.

      OK
      Sound from the audio system can be heard.

    NG

    REPLACE REAR NO. 3 SPEAKER (LEFT HAND) Click here

    OK

    REPLACE WOOFER BOX SPEAKER Click here

  10. INSPECT REAR STEREO COMPONENT SPEAKER (LEFT HAND)


    1. Reconnect the stereo component amplifier connector and rear stereo component speaker connector.

    2. Check that sound from the audio system can be heard from the speaker.

      OK
      Sound from the audio system can be heard.

    NG

    REPLACE REAR STEREO COMPONENT SPEAKER (LEFT HAND) Click here

    OK

  11. INSPECT REAR STEREO COMPONENT SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and rear stereo component speaker connector.

    2. Check that sound from the audio system can be heard from the speaker.

      OK
      Sound from the audio system can be heard.

    NG

    REPLACE REAR STEREO COMPONENT SPEAKER (RIGHT HAND) Click here

    OK

  12. INSPECT FRONT STEREO COMPONENT SPEAKER


    1. A01612UE01

      Resistance check


      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 7 to 9 Ω

    NG

    REPLACE FRONT STEREO COMPONENT SPEAKER Click here

    OK

    REPLACE WOOFER BOX SPEAKER Click here

  13. CHECK HARNESS AND CONNECTOR


    1. A0161FBE02

      Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.

    2. A01628BE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P29-2 (FL+) - Body ground Always 10 kΩ or higher
      P29-6 (FL-) - Body ground Always 10 kΩ or higher
      M4-2 (+) - Body ground Always 10 kΩ or higher
      M4-4 (-) - 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
      L2-2 (+) - Body ground Always 10 kΩ or higher
      L2-4 (-) - Body ground Always 10 kΩ or higher
      P29-3 (RL+) - Body ground Always 10 kΩ or higher
      P29-9 (RL-) - Body ground Always 10 kΩ or higher
      O5-2 (+TW) - Body ground*1 Always 10 kΩ or higher
      O5-4 (-TW) - Body ground*1 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
      N5-2 (+TW) - Body ground*1 Always 10 kΩ or higher
      N5-4 (-TW) - Body ground*1 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

      *1: w/ Front Center Speaker


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. INSPECT FRONT NO. 1 SPEAKER (RIGHT HAND)


    1. A0161OXE02

      Resistance check


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

        Standard Resistance
        w/ Front Center Speaker
        Tester Connection Condition Specified Condition
        L1-1 - L1-2 Always 6 to 10 Ω
        w/o Front Center Speaker
        Tester Connection Condition Specified Condition
        L1-1 - L1-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE FRONT NO. 1 SPEAKER (RIGHT HAND) Click here

    OK

  15. INSPECT FRONT NO. 2 SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and front No. 2 speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE FRONT NO. 2 SPEAKER (RIGHT HAND) Click here

    OK

  16. INSPECT FRONT NO. 2 SPEAKER (LEFT HAND)


    1. Reconnect the stereo component amplifier connector and front No. 2 speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE FRONT NO. 2 SPEAKER (LEFT HAND) Click here

    OK

  17. INSPECT FRONT NO. 3 SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and front No. 3 speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE FRONT NO. 3 SPEAKER (RIGHT HAND) Click here

    OK

  18. INSPECT FRONT NO. 3 SPEAKER (LEFT HAND)


    1. Reconnect the stereo component amplifier connector and front No. 3 speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE FRONT NO. 3 SPEAKER (LEFT HAND) Click here

    OK

  19. CONFIRM MODEL

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

    B

    INSPECT REAR SPEAKER (LEFT HAND) Click here

    A

  20. INSPECT REAR NO. 2 SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE REAR NO. 2 SPEAKER (RIGHT HAND) Click here

    OK

  21. INSPECT REAR NO. 2 SPEAKER (LEFT HAND)


    1. Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE REAR NO. 2 SPEAKER (LEFT HAND) Click here

    OK

  22. INSPECT REAR SPEAKER (RIGHT HAND)


    1. Reconnect the stereo component amplifier connector and rear speaker connector.

    2. Check that audio sound can be heard from the speaker.

      OK
      Audio sound can be heard.

    NG

    REPLACE REAR SPEAKER (RIGHT HAND) Click here

    OK

    REPLACE REAR SPEAKER (LEFT HAND) Click here

  23. INSPECT REAR SPEAKER (LEFT HAND)


    1. A0161OXE03

      Resistance check


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        O3-1 - O3-2 Always 3.2 to 4.8 Ω

    NG

    REPLACE REAR SPEAKER (LEFT HAND) Click here

    OK

    REPLACE REAR SPEAKER (RIGHT HAND) Click here