#1. "RE: Sensor cleaner" | In response to Reply # 0briantilley Nikonian since 26th Jan 2003Thu 24-Feb-11 08:41 PM
Welcome to Nikonians, Irwin
I'm not sure about the D7000 (because I don't have one), but with my D300 and D700 it is sometimes possible to hear a faint high-pitched "squeak" when the sensor clean function is activated. Placing the camera base-down on a solid surface like a desk can make the sound more audible.
Do you have reason to believe it's not working on your camera?