2012 4R beeps with key in accessory position

[Vegas Island]

My '12 4Runner has a quick horn double beep when I turn the key in the accessory position before starting the engine. Anyone know anything about this? It never did that before.

 

[hearno]

Do you have an aftermarket alarm on the truck?

 

[Vegas Island]

Do you have an aftermarket alarm on the truck?

No, I do not.