I've been having a bit of a poke around these spare connectors and matching them up to the circuit diagram.
On my RX3 there's one under the tank and 2 under the pillion seat area.
My best guess is
under the tank
----------------
Red 2 pin connector - to a solenoid valve to shut off the fuel supply.
under the pillion seat
-----------------------
White 3 pin connector - "tip over" switch to operate the shut off valve for
when you ditch your bike.
For some reason they decided not to bother.
White 2 pin connector - No idea, but I know some bikes will have a connector like this for connecting a switch to turn on the MIL light so it will flash diagnostic codes.
yeah ,you know I was tempted to short the pins
but
I didn't want to risk frying the ECU
Or maybe a side stand kill switch as the Delphi MT05 has it listed
