7 pin wiring harness for 2006 Sienna | Toyota Sienna Forum Sep 04, 2009Brad, the 118304 harness has a 4-pin connector. Did you rewire for 7-pin or just use an adapter? I was hoping to find a similar harness for the Sienna with the 7-pin receptacle already attached. Oh, well. I found several sources that provide wiring diagram for 7-pin so guess that wouldn't be much of a problem.7-Pin wiring ques. | Toyota Sienna ForumSep 01, 2018Toyota Sienna Forum - siennachatSep 03, 2009See more results Toyota Sienna 7 Pin Wiring Harness | Car Picture Update Sep 28, 2017Toyota Sienna 7 Pin Wiring Harness is the most browsed search of the month. If you need an image of Toyota Sienna 7 Pin Wiring Harness much more you can look the search on this site. We have recommendations to the background of the car you could see on the Wikipedia. A car (or vehicle) is a wheeled motor vehicle utilized for transportation.