How to pair ICS phone with other device that has no Bluetooth PIN
I don't think it'll work out of the box, you'll need an app that has the required code to work around the default Bluetooth protocol of requiring a PIN for devices to be paired securely.

There is an app called WiiScale which allows a user to link the Wii Balance Board with their Android device, provided they're rooted. The plus point of course is that it's compatible with CM which you're running. :-)

Alternate app: FitScales