I *think* the TCU didn't get BT until 2004 (not sure about US models), irrespective of the BT logo on the sticker. You may need a later model TCU and/or Navcoder and Resler interface to enable the BT. The BT antenna is usually a cream connector on the TCU, which your TCU doesn't have, lending weight to the lack of BT.

The spare connectors are for a GSM antenna switch/booster/filter device for the snap in cradle.

You may or may not have the snap in 12 pin connector under the console du to the lack of GSM wiring in the trunk area (unless you have to wire the purple FARKA to the missing switchbox and the black/purple goes up to the front of the car). That would be something to check. On X5 retrofit the BT antenna goes in the trunk, and the signal strength can be a little low for some handsets.