Most of what you need to fix this problem is probably contained in these posts. I would start by disconnecting and reconnecting the battery. Then I would check fuses 5, 11, 12, 13, and B with a multimeter or test light. Be sure to test at the connectors as opposed to the fuse itself, so you can be sure that not only is the fuse good but that it also is getting a good connection. Hopefully, the solution to your problem will be found somewhere in there. Otherwise, you may have a problem with the actual ATA unit itself. I believe there is a way to bypass it, but I'm not 100% on that. You could also obviously replace it if it is bad, but that's a choice you have to make based on how much money you're willing to spend for a given level of functionality. Since this post was made back in 2008 I'm going to assume that you no longer need this response, but maybe someone else will. I find that usually disconnecting the battery resets the alarm.

**Edit**

I'm pretty sure that the fix for bypassing the ATA is simply jumpering the K38 relay. You can find the correct pins and wire colors earlier in this thread.