Final answer:
A FAULT light with an ECAM message on the IDG 1(2) pushbutton indicates a fault in the engine generator of the aircraft's electrical system.
Step-by-step explanation:
On an electric panel, when you see a FAULT light accompanied by an ECAM message on the IDG (Integrated Drive Generator) 1(2) pushbutton, it indicates a fault in the engine generator. The IDG is part of the aircraft's electrical system and is responsible for generating electrical power from the engines. This system is critical for the majority of the aircraft's operations, including powering cockpit instrumentation, lighting, and various flight systems. A fault in this system could compromise aircraft safety, so it is monitored closely. When a FAULT light illuminated, it alerts pilots to take appropriate action as detailed in the aircraft's ECAM procedures. It does not indicate problems with the intercom system, flight data recorder, or landing gear system.