I had exactly the same problem. Believe me, it's there, where they say it is. It's under the cross member on the RHS at the rear. It only just pokes out of the harness, so can be difficult to locate and plug into. I just did a search, because I was sure someone posted a pic on here of the location. I know someone sent me the photo when I'd given up hope.
Trust that helps you find it before you go bonkers like me.
I just remembered, it was West Ozzie Glen who rescued me.
And I also recall removing the cap from the connector required the right technique. Fighting it doesn't work. It's one of those squeeze clips IIRC.