NO.8 NO AUDIO SYSTEM ILLUMINATION[ENTIRE AUDIO SYSTEM]

id0903e2818700

8

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

8	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.
1	• Is all the illumination on the audio unit turned off?	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 Step 4.
2		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 audio unit wiring harness-side connector terminal E (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.
3		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 a poor connection (such as damaged/pulled-out pins, corrosion). • Are all the pins normal?	Yes	Go to the next step.
4		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. 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 E (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.)
5		No	Repair or replace the related wiring harness (TNS signal).