Diagnostic Port or Alarm Port under Pillion Seat

[MB61YAM]

Just picked up my new to me Fazer 8, bit disappointed about the quality of some of the parts, furred alloy and rusty nuts in places even though bodywork is mint, but I digress, found a plastic coated wire ending with a four pin plug under the pillion seat, seems to have blanking plugs in, any idea what it is any of you guys ???