tarnationsauce2, do you get any sound coming out from any of the speakers? Even if it's faint...?

I had the common issue of losing sound from one side of the car (left side in my case). This was due to blown channels in the radio amp (BM54 or 53, depending on car). I sent the amp to a specialist that repaired the channels by upgrading with newer and stronger ones...it did the trick.

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers