It’s your PATS passive anti thefts system put key and turn on don’t start light alarm blinking fast on dash leave on its fast for about 2 minute then stops an will blink 1or 2 pause and then 1 2 3 4 etc if you miss first cycle it loops so wait
Ok blinks out then stop and 5-10secs it begins 1 blink pause then 1. 2 3 well
The code will be 1 3 or thirteen
gooogle PATS code 13 will explain what it is and what to do
Bravo