I guess the euro cars could have a different security system... on my GenII US car you can unlock the trunk with the key even when the central locking isn't working. Perhaps the deadbolt is different on the euro car?

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.