Honks 3 times when key turns

I have a 2020 Tacoma SR5 I got earlier this year. My problem I’m having is when I insert the key and turn to on, the horn beeps 3 times in quick succession. I changed the battery in my fob but that didn’t stop it. I can’t find any signs of an aftermarket alarm. For some reason this morning it was doing the 3 honk thing while I was driving on the freeway, it had never done it before except when I turned the key to on. I’ve searched for the same problem and can’t find any solutions except key fob battery and aftermarket alarm. Anyone have any ideas?

 

unhook car battery for 10 min
you could unplug the horn till you figure it out......and welcome

 

You've got an aftermarket alarm hidden somewhere under the dash. Find someone to remove it.

 

My suspicion as well. Could even be in the engine bay.