The short answer is: You won't get the LED running.
The long answer is given by reading this thread. Apart from the insights given by pcbcc, there are no indications how this could even be feasible. It seems like the control of the mini PCI LED control pins is different for at least some OEM versions of the Intel card (IBM at least, this we know for sure). The internal setup of the 2200 BG driver is controlled by the PCI IDs, so there may be some way to do it, but not even pcbcc has had success with that, and he was at the very bleeding edge...
Now, with the IBM/Atheros 802.11a/b/g cards available for a much more convenient price, the 2200 BG is not an attractive option any more, so I doubt that there will be put much further effort into that matter.
So, you are stuck with three options:
1. Live with the restriction
2. Buy a better card if you have the money
3. Try to fix the driver if you have the time