Hi, while searching for the fuse for my radio which isn't working(I thought that original Clarion unit from 1997 was faulty,so I replaced it), I came across a 3 pin connector,the same one that is in the engine bay.This one is under the dash and is connected to the same wire that splits and goes into the radio. Is that ABS diagnostic or something else? Forgot to say my Coupe is 2.0 16v,was 1.8 but got swapped because of blown engine. Here is the photo of the connector.
https://imgur.com/a/fA98Rs7Also off topic,hopefully someone can guide me why radio isn't turning on, I couldn't find any fuses for radio in the fuse box. I didn't mention I also replaced the front speakers because they were falling apart(and probably didn't also work).