With all the computer controlled electronics, relays, solenoids, servomotors, and so on that cars have nowadays, certain noises are to be expected. I came to appreciate this with the electronic throttle in my current (soon to be former) car, which can be heard cycling open and closed before the engine starts (much more noticeable if you are standing outside the car and use the remote starter), and also clicks & whines after shutting the car down for 30 seconds or more. Eventually one learns to disregard those kinds of noises after a while and accept them as "normal" or the "car doing its thing". Obviously this is not true of knocking noises, that's a whole different story, but electronics noises are to be expected since cars are so electronics-laden now.