When you are in your car running and it is quiet, ( no radio, talking etc) every time you step all the way down on the break pedal you can here a electronic sound. Does not matter what gear I m in.... I assume it normal and part of the drive/neutral system this car has.
Mine does this too. However, I've noticed the Cruze makes all sorts of electrical type sounds sittling still with the key in the ignition and radio on, but not the engine. I sounds like something cycling in the system, but I don't know what.