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2008 - MX-5 - Body and Accessories

NO.4 NO SOUND FROM SOME SPEAKERS (VEHICLES WITHOUT Bose) [AUDIO]



4

No sound from some speakers / Possible DTC: —

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

  • Audio unit malfunction

  • Short circuit inside speaker

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

  • Poor connection of audio unit connector, terminal damage


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:

    • The speaker outputting sound changes in the order of left— door speaker, right — door speaker, left — rear speaker and right — rear speaker.

  • Is there any speaker that does not output sound?

Yes

    If no sound from some speaker:
  • Go to the next step.

    If no sound at all:
  • Go to the troubleshooting of “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

Repair or replace the related wiring harnesses or 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.

5

  • 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 speaker.

(See DOOR SPEAKER REMOVAL/INSTALLATION.)

(See REAR SPEAKER REMOVAL/INSTALLATION.)

(See CENTER SPEAKER REMOVAL/INSTALLATION.)

No

Replace the audio unit.

(See CENTER PANEL UNIT REMOVAL/INSTALLATION.)

(See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.)

(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)




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