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Hi
I’m having this exact identical problem. I just changed the aux battery and it didn’t fix it. it’s still lit up like a Xmas tree.
Did you ever resolve this issue?
A while ago you installed a ipod/bluetooth connector in your non aux s550. I have a 2007 s550 with no aux and the dealer says it cant be turned on.. Could you provide some much needed guidance on how to turn on aux in comand?