Managed to pull the boot lining out today and found where the lead went.....it went to small silver box behind the Attessa System. The reason the switch was not working before was becuase it had come loose from the connection so i reconnected it, all working now.
Went for a quick burn and just from the torque split guage, it seems that with it one position, there is minimal torque to the front wheels (but these is some, NOT RWD) middle setting is as per normal attessa control, and then top position is heaps more front torque and results in a lot of chatter when taking off quickly when the front wheels are struggling for grip.
I guess that i would be much better off just leaving it in normal position, to make sure i dont end up with any problems associated with driving in RWD mode??