Sometimes it Beeps.... Sometimes it doesn't

[Padawan]

The beep indicates that one of the protected areas is not secure when you are locking it.

[kabel]

probably the center console.

[pauldee]

Pad is correct, and 99% of the time, the culprit is the storage bin between the seats. The bin is protected by the alarm. Usually, you just pop the bin open, then shut it again, and the alarm will then be happy. If the alarm still beeps, check to be sure that the front and rear trunks are shut and latched.