Looks like the wiring I found in my 400E which was definitely aftermarket.

Mine was wiring for a third party cell phone instalation, hands free, etc. I also removed a second alarm / possible remote starter. Pain in the but to figure out what is what and what was added.

In general if you see bare wires like those shown you are dealing with somthing hacked in by a third party. factory stuff has neat wiring harnesses that are wrapped.

Good luck
Paul