What Is This Connector For?

[dubboy]

Please can anyone tell me what this small 3 pin connector is for and where it should be plugged into? It is in courtesy light area in headlining.

Van is a Kombi Highline with auto wipers/lighting but I can see other 3 wires going to mirror already. I can't see anywhere it can plug into.

Was left unplugged by converter but might have been unplugged originally.

Thanks

 

[Pauly]

Looks like the connector for the rain and light sensor by the rear view mirror