OK, the slate green isn't reverse, you are right Slate Green is the right colours, but where did you find it as colours are re-used.
It seems to live in one of the 8 ways, pin 3 of one of them (power not speaker) is the one that goes down to the satnav pin 10. I have to say the circuit is confusing and it might be in pin 1.
It was certainly there and connected on mine, though. Can't check it really as I converted to BMW plug
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