URGENT HELP, strange buzzing noise coming from rear

I just turned off my car, and with everything off and the key removed, there is a buzzing noise coming from beneath the rear right side speaker area, underneath the lowest hump. See below as an example. The buzzing is coming from a little beige box beneath the lowest right hump:

http://nissanzsite.com/wp-content/uploads/2010/08/DSC06756.jpg

The beige box is inside a plastic cover with fur on the inside. The box is hot to touch. I have disconnected the battery and of course it turns off. as soon as I reattach the battery, it starts up again. Please help if you can.

 

that's the ABS pump.

 

Thanks Anti, any clue why the ABS pump would be running after the car has been turned off?

 

found some more info here:

http://forums.nicoclub.com/ack-abs-light-on-loud-buzzing-from-actuator-t573993.html

 

sorry man, no idea personally.

 

Pull a relay or fuse to disable it. Then check all your relays and fuses.
Guy down the road had the same problem

 

All fixed! unplugged the battery and left it over night, she's all good again! Thanks for your help fellas!