What plug is this, ABS related?

[Ph1 Tom]

I removed my ABS a while ago but one of the plugs is still connected.
The smallest plug is the ABS sensor in the hub, the big plug is to the ABS module. The middle sized one is still connected but I don't know if this goes somewhere where its not needed. The wires one the plug pictured are green and brown, the other side of the plug has white and black wires and goes towards the fusebox along the wing.

Do I still need this connected?

 

[Ph1 Tom]

Well it still runs without it, haven't driven the car though so don't know for sure it isn't something like the speedo.