I think kiwi knows where to find the speed wire in the trunk. Ask him or do a search for his post on this. The big white plug with the 4 wires I think is X1532 and pin 1 is the RT/GN power and goes to nav blue plug (X1313) pin 1. Pin 2 BR is ground and goes to blue pin 10. Pin 3 is I-bus WS/GR/GE and goes to blue 3. Usually the adapter cables have a mate plug to attach to X1532. Go to Google and search for WDS and spagetti as it is a site that has the WDS wiring info, other sites for WDS also. When there you can look up your car. The Items of interest are A112 Nav, A197 video module, N9 radio etc. The nav antenna is cheap on ebay. Autotronics is an expert in OZ and kiwi another expert in Switzerland ex NZ and he knows a lot about e39s in OZ and NZ. You may want to investigate the cables with the following P/Ns as they may be of help. 61 12 9 413 963, 61 12 6 907 842, and 65 90 0 017 296. Also ask your Dealer parts guy to look up the installation instructions on his computer for you and see what they show as they may help P/N 01 29 0 028 309 and 310.

All others rview my post and correct any mistakes.