Wiring identification

I have an Android head unit but it seems that all the features do not work properly, mainly to do with reading the canbus, so I removed the unit to check the wiring and I have one connection spare coming from the head unit. This is not really surprising as I have never found a car yet that has the same connections, so it may just be a common adaptor, but I have three wires in the car that I have no idea what they are. I was hoping somebody could identify them. One lead does sort of fit in the spare connector, but is not the same size. 

Sorry about the fussy pictures, my phone is on its way out.