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2008 - MX-5 - Body and Accessories

NO.9 NO AUDIO SYSTEM ILLUMINATION [AUDIO]



9

No audio system illumination / Possible DTC: 09:Er20, 21:Er19

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

  • Audio unit malfunction

  • Burnt fuse (TNS signal)

  • Open or short circuit in TNS signal wiring harness

  • Center panel malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Is all the illumination on the audio unit turned off?

Yes

Go to the next step.

No

Replace the center panel.

(See CENTER PANEL UNIT REMOVAL/INSTALLATION.)

(See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.)

2

  • Turn the ignition switch to the LOCK position.

  • Inspect the fuse (ILLUMI).

  • Is the fuse normal?

Yes

Go to the Step 4.

No

Go to the next step.

3

  • Turn the ignition switch to the LOCK position.

  • Disconnect the audio unit connector (24-pin) and inspect the continuity between the audio unit wiring harness-side connector terminal 1E (TNS) and the ground.

  • Is there continuity?

Yes

Repair or replace the short circuit in the suspect wiring harness. After repairing the wiring harness, replace with the appropriate standard fuse.

No

Go to the next step.

4

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

  • Inspect both the audio unit and wiring harness-side connector terminal 1E for a poor connection (such as damaged/pulled-out pins, corrosion).

  • 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.

5

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

  • Turn the ignition switch to the ACC position.

  • Inspect the voltage at the audio unit connector terminal 1E (TNS).

  • Is the voltage B+ when the light switch is turned to the TNS position?

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 related wiring harness (TNS signal).




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