parking sensors

you installed an nx on your fl smax? really? one with dvd or sd navigation?

In some configurations, the PDC signal was sent via the radio speakers. Is the PDC button flashing (Indicates a fault)? Maybe your car has no separate speakers for the PDC.

The voice control cabling is a little bit different, because it is now not longer controlled by a module, rather by the SD-Navi.

Here you go, Anleitung: Aktivierung der Sprachsteuerung bei nachgerüstetem NX / SD-Navi-Plus

Lee, have you tried Talkford.com? Very capable UK based people there....

Hmkay.....I am also a member there and quite satisfied.....

As long as we know, the PDC Sound is output on audio speakers with Sony CD6000 radio. Never known of any navigation system, not SD and not DVD behave this way.
Therefore there are no PDC-speakers installed.
So i think you need to install those. One is above the Convers+ and the other one in the roof at the C pillar. In SMax, the rear speaker is on driver side (in England) behind the rear seats. Those speakers are rellay cheap. You can get them for about 2€ each (new ones).

Here some pictures of the speakers