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2008 - MX-5 - Body and Accessories

NO.2 NO POWER TO THE ENTIRE AUDIO SYSTEM [AUDIO]



2

No power to the entire audio system / Possible DTC: 09:Er20

    Troubleshooting hints
  • Poor connection of audio unit connector, terminal damage

  • Audio unit malfunction

  • Burnt fuse (B+)

  • Burnt fuse (ACC)

  • Open or short circuit in power supply (B+) wiring harness

  • Open or short circuit in power supply (ACC) wiring harness


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Turn the ignition switch to the LOCK position.

  • Inspect the following fuses:

    • ACC

    • ROOM

  • Are the fuses normal?

Yes

Go to the next step.

No

Replace with the appropriate standard fuse.

  • If the fuse is melted, inspect the wiring harness for a short to ground. Repair or replace the wiring harness, then replace the fuse.

2

  • Remove the audio unit.

  • Inspect the connection of the audio unit connector (24-pin).

  • Disconnect the audio unit connector and inspect both the audio unit and the wiring harness-side connectors for a poor connection. (such as damaged/pulled-out pins, corrosion).

    • Terminal 1B (B+)

    • Terminal 1R (ACC)

    • Terminal 1W (GND)

  • Are all the pins normal?

Yes

Go to the next step.

No

    If audio unit connector has a poor connection:
  • Securely connect the audio unit connector.

    If the wiring harness-side connector is malfunctioning:
  • Repair or replace the pins and/or the connector.

3

  • Connect the audio unit connector.

  • Inspect the voltage for the power supply line (B+, ACC).

    Specification:
  • Ignition switch ON: 11.5 V or more

  • Idle: 12.5 V or more

  • Is the voltage normal?

Yes

Go to the next step.

No

Repair or replace the related wiring harnesses.

4

  • Turn the ignition switch to the LOCK position.

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

  • Inspect the continuity between audio unit wiring harness-side connector terminal 1W and the ground.

  • Is there continuity?

Yes

Replace the audio unit.

(See CENTER PANEL UNIT REMOVAL/INSTALLATION.)

(See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.)

(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)

No

Repair or replace the wiring harness.




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