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2003 SL55
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Discussion Starter #1
I need to know pin-out of all the connections to the factory head unit. I know pin-outs to the 4pin connector, and I know that the 5pin connector is to the auto volume adjust (which I won't use). There is a 3pin connector that goes to a box on the back of the head unit labeled line out, which I'm sure goes to an amp. I think I need cable adaptor for the 3pin conector. Or if I kwen what the pin out is I'll be OK. thanks Joe
 
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