2002 Suspension Height
 

If I manually set my suspension height, how do I return to automatic operation? For instance, if I move the height from "3" to "2", what do I have to do to let the car shift its height automatically to suit changing speeds again?

If I understand your question...
 

Just manually put it back into "3".

Think of the manual change in the '02 as the max height setting. It will still drop with speed from that setting and return to it when speed decreases to that settings limits.

setting "4" is the only odd one in that you can only get there from "3" and it won't return to it once it leaves without pushing the button.

fj..

Just drive at the prescibed speed
 

My understanding is that the 2002 does not have a manual setting in the same sense as the 2001. The speed sensitivity is always active on the 2002 and cannot be defeated. If you manually adjust from "3" to "2" as you say, all you need to do is exceed 75 mph on the highway for a while and you will see your car drop down to "1" and then go back up to "2" when you get off the highway. Actually, under that scenario, the 2001 behaves the same way, even in so called "manual" mode.