DeVille a/c?

My in-laws Cadillac DeVille a/c stopped working, and low refrigerant-no a/c came up on the message center. I took it to the shop I work for, checked the refrigerant level, and had about 100 psi static pressure. Just to be sure, I reclaimed, evacuated, and recharged the system, still had 100 psi. Jumped the low pressure switch, no change. Un-hooked the battery cable for 5 min, bang, the message disappeared and the a/c started working fine. Anyone have any idea what would cause the eatc to need a reset to begin with? A bad connection at the low pressure switch, or a switch starting to fail, maybe?

DeVille a/c?
Hi, Yes. What year is the car? If it is less than maybe 9 years, or so, the computer controls (everything in some way) I think you did the right thing by unhooking the batt. That resets, and starts from (zero). All you need is a wire thats not hooked, or wet,or dirty, or something to break contact, and you have to start from (zero) again. I still like the Model A Ford (They are east to figger out you know! Hope this helps?
Reply:Could've been anything like the other guy said, a surge in the system, even a hiccup could set it off. If checked all the connections wait and see what happens...