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It is more than likely for the trip computer - if fitted!
You may well have the switch fitted in the stalk but the computer itself isn't installed.
Manufacturers quite often fit the wiring etc in place in all cars and then only fit the bits needed fro that particular model.
It keeps costs down, they only have to make one wiring loom etc.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.