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2008 - MX-5 - Body and Accessories

NO.4 NO SOUND FROM SOME SPEAKERS (VEHICLES WITH Bose) [AUDIO]



4

No sound from some speakers / Possible DTC: —

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

  • Audio amplifier malfunction

  • Short circuit inside speaker

  • 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

  • Poor connection of audio unit connector, terminal damage

  • Poor connection of audio amplifier connector


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Turn the audio unit on.

  • Press the AUDIO CONT button 1 s or more (BAL/FAD cancel mode).

  • Press the POWER button and simultaneously press down the SCAN/AUTO-M switch for approx. 2 s.

NOTE:

  • This function outputs sound to each speaker sequentially to allow determination of which speaker is not emitting sound.

  • Is there any speaker that does not output sound?

Yes

    If there is no sound from some speakers:
  • Go to the next step.

    If there is no sound at all:
  • Go to troubleshooting “No.3 No sound from all speakers”.

No

The troubleshooting is completed.

2

  • Does the same speaker output no sound if the audio source is changed? (Radio, CD)

Yes

Go to the next step.

No

Replace the audio unit.

(See CENTER PANEL UNIT REMOVAL/INSTALLATION.)

(See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.)

(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)

NOTE:

  • If a different speaker outputs no sound, the audio unit is malfunctioning.

3

  • Turn the ignition switch to the LOCK position.

  • Inspect the connection of the audio unit connector (24-pin). (For sound signal line)

  • Is the connector connected securely?

Yes

Go to the next step.

No

Connect the audio unit connector (24-pin) securely.

4

  • Turn the ignition switch to the LOCK position.

  • Remove the audio unit.

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

  • Inspect the continuity between the audio unit wiring harness-side connector and ground.

    • For door speakers
    • Terminal 1A (LH+) — GND

    • Terminal 1C (LH-) — GND

    • Terminal 1D (RH+) — GND

    • Terminal 1F (RH-) — GND

      For rear speakers
    • Terminal 1S (LH+) — GND

    • Terminal 1U (LH-) — GND

    • Terminal 1V (RH+) — GND

    • Terminal 1X (RH-) — GND

  • Is there continuity?

Yes

Go to the next step.

No

Go to Step 6.

5

  • Inspect the continuity between the following terminals of the audio amplifier wiring harness-side connector (24-pin) and the audio unit wiring harness-side connector (24-pin).

    • For door speakers
    • Terminal 1T (LH+) — Terminal 1A (LH+)

    • Terminal 1R (LH-) — Terminal 1C (LH-)

    • Terminal 1P (RH+) — Terminal 1D (RH+)

    • Terminal 1N (RH-) — Terminal 1F (RH-)

      For rear speakers
    • Terminal 1L (LH+) — Terminal 1S (LH+)

    • Terminal 1J (LH-) — Terminal 1U (LH-)

    • Terminal 1H (RH+) —Terminal 1X (RH-)

    • Terminal 1F (RH-) — Terminal 1V (RH+)

  • Is there continuity?

Yes

Go to the next step.

No

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

6

  • Inspect the connection of the audio amplifier connector (24-pin, 8-pin).

  • Is the connector connected securely?

Yes

Go to the next step.

No

Connect the audio amplifier connector (24-pin, 8-pin) securely.

7

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

  • Inspect the continuity between the following terminals of the audio amplifier connector (24-pin) 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.

8

  • Inspect the continuity between the following terminals of the audio amplifier wiring harness-side connector (24-pin) and ground.

    • For door speakers
    • Terminal 1M (LH OUT+) — GND

    • Terminal 1K (LH OUT-) — GND

    • Terminal 1I (LH OUT-) — GND

    • Terminal 1O (LH OUT+) — GND

    • Terminal 2C (RH OUT-) — GND

    • Terminal 2D (RH OUT+) — GND

    • Terminal 2F (RH OUT+) — GND

    • Terminal 2E (RH OUT-) — GND

      For rear speakers
    • Terminal 1U (LH OUT+) — GND

    • Terminal 1W (RH OUT-) — GND

      For center speaker
    • Terminal 1Q (OUT+) — GND

    • Terminal 1S (OUT-) — GND

  • Is there continuity?

Yes

Repair or replace for a short circuit between the audio amplifier and speaker wiring harnesses or inside 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 amplifier operates to cut the sound.

No

Go to the next step.

9

  • Remove the suspect speaker.

  • Disconnect the speaker connector (2-pin) and inspect the resistance of the speaker.

  • Is the resistance normal?

    Specification:
  • Speaker resistance + wiring harness resistance

NOTE:

  • If the speaker lead wire contacts either the ground or vehicle frame, replace the speaker.

Yes

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

No

Replace the speaker.

(See DOOR SPEAKER REMOVAL/INSTALLATION.)

(See REAR SPEAKER REMOVAL/INSTALLATION.)

(See CENTER SPEAKER REMOVAL/INSTALLATION.)




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