Mystery connector?
I added some washer fluid to my car and noticed, for the first time in 17 years, that there's an unused connector near the top front of my engine compartment next to the battery box intake. Is it supposed to be unused? Am I missing something? I have no error lights except for the air bag, but that's because the spring ring or whatever it's called in the steering wheel wore out. The car is a 2007 Mazda 3 hatchback.
Cut it off and see what stops working.