Okay, so I've head this noise coming from the bottom side mid-to rear of the car a bunch of times. It sounds normal, and happens either with the car on or off. It almost sounds as though it's adjusting the ride height, or it's an ABS actuator reliveing pressure or a pump or something...but it's this electric "grumble" high pitched noise. Anybody with a wagon like this know what I'm talking about? It's weird, and seems like it sounds off whenever someone is getting in the car, or after you let off the brake...i dunno. Thoughts?