Lexus Troubleshooting Questions? Ask a Lexus Expert
I am sorry that you have not been helped yet. I just came online and saw your question
Ok, do you know if yours has a separate amplier? If not, it is located at right rear of trunk floor behind the trim panels
I need to know this so I can pull the correct schematics
Ok, that narrows it down. Either a loose or chafed wire at the audio unit connector or internal fault in the audio unit. So you will need to remove the audio unit and check connector for loose or chafed wiring and repair. If ok, then replace audio unit. Directions are attached to remove the audio unit
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