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Having similar issue
Amp, TCU, and Sat have solid red blinking light. I checked the headunit's MOST connection under my steering wheel (left hand drive) and it DOES have a light but it is very faint.
I took this to mean that my Sat is bad and I put my optical bypass loop on it. The Headunit's Most connect remained weak.... I then tried the TCU and AMP still weak....
Does weak red light mean that the fiber optical wires in my car has been broken???
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