I have a 2006 dodge ram 1500 and at various times while i enter the vehicle the horn goes off for a couple minutes and the interior & cargo lights stay on.
Sounds like you have a factory alarm that may be armed by a lick sequence but not disarmed if a different sequence is used or if a sensor is faulty.
Does it go off ocationally while you are using you turn signals?
Check you multifuntion switch, if it is shorting out it can send power to you horn from when your interior lights is activated. Hope this helps
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