THANKS, ASC constantly lighted on dashboard is fixed!!!!
First, I tried disconnecting the battery to reset the system; this didn't solve the ASC light.
Second, I looked under the wheel areas, but didn't see any loose wiring.
Third, I looked that the cable that connected to the throttle housing; and there it was. The cable was fine, but it had come off the bracket which was loose and didn't have any tension. I reattached the cable and braced; tightened with correct tension, problem went away. I'm very happy to say that everything is back to normal. Just wonder why that happened just after the tire change. sabotage? hmmm.
As for the alarm, has not gone off in the last 2 hours after I unplugged the battery cable. Let's wait and see.
Thanks everyone!! This is an awesome website. It's certainly in my bookmarks!!