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I just bought a 1998 Honda Civic EX w/moonroof. It currently has an aftermarket stereo, and it looks like it has an aftermarket security alarm (no remotes, but every once in a while it goes off, and there is a siren under the hood).

Reading the manual it says that the EX model came with at least a keyless system. I've also read that that the alarm/keyless system had something to do with the factory stereo which is missing.

How do I find out without a shadow of a doubt if my particular 1998 Honda Civic EX had a factory Honda security alarm, Honda keyless entry, both, or none?

I've searched extensively here and the internet but no answer. Any answers will be greatly appreciated. Thanks in advance.

P. S.:
In case it matters, the Civic is a U. S. auto.