Dear friends
Thank you all for your answers. I found the official booklet for Smart 450 700cc and you are correct... the button is only for locking not for unlocking.
I was confused because the previous Smart we had was a 450 600cc early 2000 model. For some reason, some models which came to the Greek market and did not have auto lock etc. ( pure models ) had this function to lock and unlock from this button internally. Maybe it was a feature programmed locally in order to justify the cost of purchase in 2000 which was around 9.000euro in Greece.
Anyway I cleaned the underside of the rubber contact in the button even just for it to work as normal lock only, but no joy. At least the autolock function works correctly when driving.
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