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NO.8 AUDIO SYSTEM ILLUMINATION DOES NOT ILLUMINATE AT ALL

id0903a1803700

8 | Audio system illumination does not illuminate at all/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 | • Are all illumination on the audio unit turned OFF? | Yes | Go to the next step.
No | Replace the center panel.
2 | • Turn the ignition switch to the LOCK position. • Inspect the fuse (15A 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 (TNS) and the ground. • Is there continuity? | Yes | Repair or replace the short circuit in the suspect wiring harness. After repair the 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 E for poor connection (such as damaged/pulled-out pins, corrosion). • Are all the pins normal? | Yes | Go to the next step.
No | If poor connection of audio unit connector: • Securely connect the audio unit connector. If the audio unit side connector is wrong: • Replace the audio unit. If the wiring harness-side connector is wrong: • Repair or replace the pins and/or the connector.
5 | • connect the audio unit connector (24-pins). • Turn the ignition switch to the ACC position. • inspect the voltage at the audio unit connector terminal E (TNS). • Is the voltage B+ when the light switch is turned to the TNS position? | Yes | Replace the audio unit.
No | Repair or replace the suspect wiring harness (TNS signal).