NO.9 NO AUDIO SYSTEM ILLUMINATION [ENTIRE AUDIO SYSTEM]

id0903e2826600

9 | No audio system illumination
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Possible DTC | 09:Er20, 21:Er19
POSSIBLE CAUSE | • Center panel malfunction • Burnt fuse (TNS signal) • Poor connection of center panel unit connector, terminal damage • Open or short circuit in TNS signal wiring harness • Audio unit malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | • Is all the illumination on the center panel 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 audio unit side connector is malfunctioning: • Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION.) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.) 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.)
No | Repair or replace the related wiring harness (TNS signal).