davidpfitz said:
I had previously guessed it was near the reading lights - but for no particular reason!
On an E46 it's up near the reading lights (daft place -- only the driver needs to use it) and it's also on the left hand side and needs to be unclipped and moved in a RHD car. But that would be a stupid place to put it on a convertible, wouldn't it? The thing on top of the steering column certainly
looks like a microphone, and the other end can hear me much more clearly when I'm speaking from the Z4 than the E46, so I conclude that the mic is nearer.