Suzuki Swift IV Mz Built 2009 – Central locking is no longer possible – button inside also not

Hello together, on my 2009 BJ Swift MZ 1,3 the ZV is no longer working. That means the trunk is no longer working. Inside the button is without function. My village car has already changed the driver’s door lock. Unfortunately without success. Because still does not work. Safety is according to him also no. Does anyone have an idea? I’m afraid that this will be a barrel without floor ;( Thanks already for tips!!! PS: Click on the remote control lets the lights flash outside and inside the light goes on. The locks do not open.