CB's in the galley should trip if any high powered components fail such as ovens, boilers etc.
The only high power component in the toilet is the water heater and this also has a thermal cutout protection.
ACARS is just a communication system. Sending fault messages to the airline via the CMC, SDAC's,FWC's etc.
Avionics Smoke ECAM warning has a clear procedure to determine the problem, the SEC 2 fault shouldn't cause any problems to the aircraft by it self. The LAV Smoke caution is set off by a lav smoke detector. The ECAM caution wouldn't state which toilet this refers to. This would show on the FAP.
According to these ECAM warnings and cautions, the only one of real corncern would be the Avionics Smoke one. But this could be related to the others. Let's not forget where the cockpit oxygen cylinder is also located.