I don't know where you obtained your card from but I recently ordered one from an ebay seller in China. When the package arrived, it contained two modules. The first one I installed was not recognised but the second one was. Both looked identical so I assume one was a dud. Not sure why it was included really. I suspect the seller may not be able to test the modules and some simply do not work.
After trying each of the internal antennae, I've given up on the Apple module as the reception is so bad my mouse stutters across the screen.
I just got hold of a D-Link DBT-120 USB adaptor and it now works flawlessly with my MP1,1 using both an Apple Wireless Keyboard and the Magic Mouse. The Apple module has been removed!
So my advice to anyone wanting flawless Bluetooth functionality on an early Mac Pro is ignore the ex-G5 modules and get a D-Link.