Here is another idea I thought of today. It uses an DPST switch and a relay, tied into the horn and map light circuits. When leaving your car, activate the switch in an exterior, hidden location. When the map lights are turned on for any reason (such as opening a door), the horn will sound, and the 2nd relay locks on so only shutting off the switch or disconnecting the battery will stop it.
Enough at least to wake you up if you are nearby...
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