It looks like your car has the correct 54-pin TCU plug, so your installation should be relatively easy.

The plugs in the car are color-coded to match the color coding on the parts sticker of the TCU. You should see a row of little colored squares by the coax antenna cable plugs. Also, they are physically keyed so that they should only connect to the correct plug on the TCU.

You will need to get a Bluetooth antenna and Bluetooth antenna cable. This will connect to the cream color coded coax plug. That should be the one on the far right, by your description. The official Bluetooth antenna location on the X5 is above the TCU, I think. However, lots of people just use double-sided tape to stick it in the electronics compartment.

You do not need to connect your car's existing antenna cables to the TCU. They would only be applicable for Assist. However, if you want to connect them, just try each post-- the correct cable should only connect to its correct corresponding post on the TCU.

The SOS and wrench buttons are related to BWM Assist. It sounds like you found the mic plug and connected it OK.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input