Hello, I always used only one FB on my 2001er S60. Since we were on the road now, we also had the 2nd FB with and when it was needed, nothing moved! So I thought, the battery is empty and a new one is bought in the electronics shop and built in. – No success!! Before I assume that the new battery is not ok (should`s be!) buy one again, my question: Does there possibly have to be activated by the workshop because of the coding after battery change? Or is the battery (possibly also FB) defective? Holger