[3boystoys]

This is from the 2013 owners manual.

21. Vehicle Security Light — If Equipped​

This light will flash at a fast rate for approximately​

15 seconds, when the vehicle security​

alarm is arming, and then will flash slowly​

until the vehicle is disarmed.
http://www.chryslercommercialvehicles.com/dodge/download/pdf/manuals/2013-Challenger-OM-3rd.pdf

AMAZING, someone besides me reads the owners manual-good work.