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2008 - MX-5 - Body and Accessories

NO.3 NO SOUND FROM ALL SPEAKERS (VEHICLES WITH Bose) [AUDIO]



3

No sound from all the speakers / Possible DTC: 03:Er07, 03:Er10, 06:Er07, 06:Er10, 09:Er20, 09:Er21, 10:Er10, 22:Er07, 22:Er10

    Troubleshooting hints
  • Speaker malfunction (e.g., foreign material penetration, damage)

  • Audio amplifier malfunction

  • Open or short circuit in wiring harness between audio amplifier and speaker

  • Open or short circuit in wiring harness between audio amplifier and audio unit.

  • Short circuit inside speaker


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Press the AUDIO CONT button for 2 s or more.

  • Play the CD or radio.

  • Adjust the volume between “10” and “15”.

  • Is there sound?

Yes

The system is normal.

No

Go to the next step.

2

  • Measure the voltage at audio amplifier terminal A. (vehicle wiring harness-side)

  • Is the voltage B+?

Yes

Go to Step 4.

No

Repair or replace the wiring harness between the audio amplifier and fuse. Go to the next step.

3

  • Is there any sound?

Yes

The system is normal.

No

Go to the next step.

4

  • Turn the ignition switch to the LOCK position.

  • Disconnect the audio amplifier connector (8-pin, 24-pin).

  • Inspect the continuity between the following terminals of the audio amplifier connector and the speaker connector:

    • For door speaker (LH)
    • Terminal 1M, 1I — Terminal B

    • Terminal 1K, 1O — Terminal A

      For door speaker (RH)
    • Terminal 2C, 2E — Terminal A

    • Terminal 2D, 2F — Terminal B

      For rear speakers
    • Terminal 1U — Terminal B

    • Terminal 1W — Terminal A

      For center speaker
    • Terminal 1Q — Terminal B

    • Terminal 1S — Terminal A

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the related wiring harnesses.

5

  • Turn the ignition switch to the LOCK position.

  • Disconnect the audio amplifier connector (8-pin, 24-pin).

  • Inspect the continuity between the audio amplifier connector and ground:

    • For door speakers
    • Terminal 1M (24-pin, LH OUT+) — GND

    • Terminal 1I (24-pin, LH OUT+) — GND

    • Terminal 1K (24-pin, LH OUT-) — GND

    • Terminal 1O (24-pin, LH OUT-) — GND

    • Terminal 2C (8-pin, RH OUT-) — GND

    • Terminal 2D (8-pin, RH OUT+) — GND

    • Terminal 2F (8-pin, RH OUT+) — GND

    • Terminal 2E (8-pin, RH OUT-) — GND

      For rear speakers
    • Terminal 1U (24-pin, OUT+) — GND

    • Terminal 1W (24-pin, OUT-) — GND

      For center speaker
    • Terminal 1Q (24-pin, OUT+) — GND

    • Terminal 1S (24-pin, OUT-) — GND

  • Is there continuity?

Yes

Repair or replace the related wiring harnesses or the speaker unit.

NOTE:

  • If there is a short circuit between the speaker wiring harnesses or the speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.

No

Go to the next step.

6

  • Turn the ignition switch to the LOCK position.

  • Disconnect the audio amplifier connector (24-pin) and audio unit connector (24-pin).

  • Inspect the continuity between audio amplifier terminal 1V (vehicle wiring harness-side) and the audio unit terminal 1J (vehicle wiring harness-side).

  • Is there continuity?

Yes

Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness between the audio amplifier and the audio unit. Go to the next step.

7

  • Is there any sound?

Yes

The system is normal.

No

Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)




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