'03 CTS Locks Engage/Unlock Every 30 Secs... HELP!
 

This problem started the other day out of nowhere. While driving, no problem. When I turn the car off, whether I lock the doors or not, after 30 secs or so the automatic locks will engage (if I lock it with remote or by hand) or (if unlocking) and will continue doing this EVERY 30 secs indefinately. I had to turn off the feature "lights flash/horn sounds" at "key out" and "on remote lock" because of this!

Also, what happens depends on which button I hit. If I hit the panic button, every 30 secs the alarm goes off. If I hit the lock button, the car attempts to lock every 30 secs or so. The same with unlocking... Very imbarrasing when people are around... Someone please HELP!

RE: '03 CTS Locks Engage/Unlock Every 30 Secs... HELP!
 

Wow, that's weird.
Could be a bad RIM or a bad ground or a bad antenna module.
Or...or..or.......

I suggest taking it to caddy.