How does your plane know if there's ice?
Hopefully there are trained pilots aware of those conditions favourable for ice accretion that can manipulate engine and/or wing anti ice as required. The Airbus Dual Advisory Ice Detection System (DAIDS) is not intended to replace pilot's judgement but to support it.
Ah. That makes sense. On airplanes with detectors, does the A/I come on automatically?
Nope, we can still enjoy pressing the P/B.