ok after a bit more searching i have possibily found some answers,just need clarification from more experienced minds
on the new bmw loom i have the spare black plug.
in this plug there are 3 wires, the white with yellow stripe goes to black and white speed signal tapped from either pdc(park distance control???)
or adc (self-leveling suspension)
and the other wire yellow with red stripe i can tap int reverse lights for reverse signal, that leaves the plain brown wire which i take it i just run to an earth? , do these sound correct?
still need guidance on no voice coming through from sat nav.