Audi A4 B6 Avant 2002 , Front speakers stopped working after I tried to plug rear speakers


New Member
Sep 26, 2022
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Hello Everbody

I have Audi A4 B6, Avant 2002 , and I have Radio pioneer mvh 110ub, and I wanted to enable rear speakers with subwoofer
So I bought this ISO reduction
I connected it to my cables to radio and cables with car , and I tried to start radio but after I turn on engine
radio won't start so I gave it back to my previous settings as it worked , but when I started engine , Radio turns on but I can't hear
anything from my front speakers now. So I probably made short circuit somewhere , but I don't know where or how to check it.
what should be wrong ? I attached photo how I conneted it , it was probably wrong obviously.
IMG 4280