Extra plug under dash

[RossO]

I recently installed an Inferno heater in my 2018 Defender Xmr and while I was under the dash I noticed an extra rocker switch plug from the main harness not being used that was just zip tied out of the way.  Does anyone know what this would be for?  It already has the 3 mode switch and front diff lock switch from factory.

[amblecop]

I think it's a switch that allows you to change the mode of the engine. Add a rocker switch and you can change the mode from inside the cab rather than the plugs under the bonnet

[RossO]

I don't think its that because it already has the "3 mode" switch for work, normal and eco.  I'm assuming it is a rear diff lock or "turf mode" switch, but being that it is a 2018 Xmr it does not have the ability to have a unlocking rear diff. 

Not too concerned about it.  Just thought someone on here might be able to tell me exactly what it was for.