When the car is not started but powered on, there are crackling noises coming from the engine bay. What's going on?

The cold start just makes a buzzing current sound, right? Where's the crackling noise? This doesn't sound like it's powered on now.

Didn't start the engine. I understand it as just powering on, without starting the engine? You mean not pressing the brake pedal, just pressing the start button once to power on the vehicle system? At this time, you might hear a few clicking sounds from the engine bay or under the steering wheel. These are similar to the sounds of electromechanical contactors working, which almost all cars have, but it's just a few clicks. It seems like you actually started the engine, didn't you?!