Technical Description (Comment)

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

The outer tone alarm sounds under the following conditions.

When the door is locked or unlocked with the keyless or keyless operation function
Door lock does not operate.
The keyless operation key is brought out of the vehicle.
Also, with a customization function, "Tone alarm answerback" may be set to "Not Sound Tone alarm."