The alarm theory mat still hold true. My new car also came with keyless entry, and reading furthur into the manual revealed it to be a security system as well. One of the things that will set mine off is locking the car with the remote, then opening any door or trunk with the key. Try this with yours. Lock the car with the remote, then unlock it with just the key. Mine begins to sound a few horn chirps before going full blast to warn you that you forgot to use the remote.