Bluetooth Daughter Card (14 pins)
IBM FRU PN: 39T0497
One can enable Bluetooth by pressing Fn-F5, or running this command:
echo "enable" > /proc/acpi/ibm/bluetooth
The ibm_acpi kernel module must be loaded or compiled into the kernel for this to work.
(Verified on a ThinkPad Z60m and Z61t.)
On the T61 and Z61, the Wireless' kill-radio switch disables both WiFi and Bluetooth.