2000 Deville DHS climate control

When the car is started you can hear some clicking from under the dash for a few seconds and everything but the defrost works.

I had a Dodge Caravan that did the same thing after the battery died and I had to recallibrate the system by pushing a series of buttons on the dash. ( got the proceedure from this site, thanks).

Is there a similar proceedure for this car? No codes are displayed.

Thanks