well I dont have the diagram on me but here is some random info, I dont know how old they are, but if they're stuck, then odds are they need to be changed anyway
http://www.asashop.org/autoinc/june/Tech2tech.htm
If I remember right, should be 4 wires, one of them should be the signal wire, the others are either power or grounds, I think, but if you do change em out, they are delicate and from what I was taught, a dropped sensor is a bad sensor, and they're kinda expensive so, be careful