siren with remote start door lock pulses

hi there. I have a few cars with auto page remote start keyless entry only. I want to make my horn blow or a siren chirp as if it has an alarm to other people. I was thinking of using light flash for one chirp lock and two chirp unlock confirmation. however that would lead to chirping during start function. Trying to figure how to use door lock and unlock impulses. another reason for wanting to do this is so I know the car locked if from a distance. Thanks

What model Autopage? I've only installed about a dozen Autopage systems, but they've all had an option for horn honk output on lock, and or unlock.

the autopage has a horn output. use that to trigger a relay for your applicationTed

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