Audi S7 Audio System Goes Silent, Complete Failure Fix

As someone with decent experience working on Audi sound systems, I dealt with a similar issue on my 2019 Audi S6. The symptoms were identical, complete radio silence and no audio output through any source. After trying basic troubleshooting like fuse checks and system resets, I took it to a workshop where they diagnosed a defective bass speaker that had shorted out, causing the entire sound system to fail as a safety measure. The repair involved replacing the faulty speaker and running a diagnostic on the amplifier to ensure no additional damage occurred. The total repair cost was 280 Euro, which included parts and labor. The sound system has worked flawlessly since the fix. Before suggesting specific solutions, could you share: Have you noticed any sound distortion before the complete failure? Did you recently use the auxiliary input? Does the head unit display still work normally? Are there any error messages on the MMI screen? Have there been any recent software updates? This information would help determine if your issue matches what I experienced with my S6 or if it might be something different.

Had the same thoughts about checking basic stuff first. Just got my Audi serviced at 177443 KM and they checked the USB audio connections during maintenance, all was fine then. The audio connectivity issues started right after I tried using the volume control through the steering wheel buttons. The MMI screen works perfectly and shows track info, but complete radio silence from all speakers. Worth noting the bass sounds were a bit off before total failure. No error messages showing up anywhere in the system. Starting to think it might be an amplifier issue rather than speakers since theres zero sound output from any source.

Thanks for the additional details. Based on your description and comparing it to my S6 experience, this sounds more like an amplifier issue than the speaker problem I initially had. The key indicators are: Issues starting after using steering wheel volume control, Complete audio loss across all sources, Previous bass sound issues, Working MMI display with no error messages, Zero sound from any car speakers despite system appearing functional In my case, after the speaker replacement, I actually faced a similar complete audio failure about 6 months later. It turned out to be a faulty amplifier that needed replacement. The repair cost was higher at 620 Euro, but the sound quality returned to perfect after fixing. Since you mention the bass sounds were off before the failure, I recommend having both the amplifier and subwoofer checked. The volume control malfunction through the steering wheel often points to an amplifier communication issue in these models. Quick test you can try: disconnect the battery for 30 minutes, then reconnect. This sometimes resets the amplifier connection. If this doesnt work, a professional diagnostic is needed to confirm whether its the amp or something else in the audio chain.

The steering wheel volume control connection makes a lot of sense. I appreciate the detailed response and battery reset suggestion. Since my car speakers are still completely dead and the sound quality issues started with the bass, I'll likely need that amplifier replacement you mentioned. The 620 Euro cost is steep but better than replacing the entire sound system. Already scheduled an appointment at my regular shop for next week, and I'll have them check both the amplifier and subwoofer as suggested. The auxiliary input and Bluetooth were both working fine before this started, so that seems to confirm it's not a connectivity issue but rather something in the amplifier system itself. Just hoping I can get the audio system back to normal without any major component replacements beyond the amp. The MMI is still displaying everything correctly, so at least that part of the system is working as it should. Thanks for sharing your similar experience, definitely helps narrow down the likely causes before heading to the shop. Will update once I get the diagnosis.