HI Jeff, the change is not shown on the wiring diagrams, you are correct. However, it does exist in the real universe. It's been a thorn in my side for a while, thus why we've been trying to nail it down to a production date. Also, the 89.5 is unique, it's different than both the '89 and '90 models.
I too have noticed a number of mistakes on Toyota wiring diagrams.
I too have noticed a number of mistakes on Toyota wiring diagrams.