While I was putting a SR steering wheel into my car the other day, I noticed there's an extra plug in there that isn't hooked up to anything.

Here's a picture for reference.
https://micra-forum.com/attachment.p...7&d=1494720844

The left harness is the horn and the steering wheel controls. The airbag comes in through the middle, and the right side is a 2 pin that's just kind of there. When pulling the wheel from the donor car, there wasn't anything hooked up to it either. Any ideas?