So I just bought my 1999 audi A6, love the car but I've noticed that if the alarm is active the key won't disarm the alarm (key fob doesn't work) and if I unlock the car and hold the key over it doesn't roll down the windows like I see other audi vehicles do,

It also doesn't activate the puddle lights or interior lights when I open that door but all other doors work fine,

I've been reading about some switch that could be it, what can I do to test this issue? And make sure I replace what's needed,

Thanks