Hello,
Link below has a great list of tools needed.It is a T40 security torx and not a T 30 but if you read down a little you will see Post 64-67 is where you find what you need. It also has pictures.
https://www.crossfireforum.org/forum...tml#post253613
Ok for new sirens if this is your issue.
OEM P/N does not chirp 5124443AB
MB that chirps 512443AA I have this one as a replacement. I like the chirp personally it is not loud and will chirp 3 times if all latches are secure if something is wrong like a door is open or the trunk it will only chirp twice. I have not tried to leave multiple latches open to see if it will only chirp once if both doors are open or the trunk and a door is open.
This should get you started.
To answer your question yes they will still blink when you unlock and lock the car as well as when the alarm/panic button is pressed.
Further questions please ask.