I have the exact same question/problem and can find no resources. A professional hitch company said they don't actually know until they tear into it. Try this site: http://www.etrailer.com/tv-wiring_install_1998_toyota_sienna.aspx
Go to an auto parts store and purchase a pre-wired dedicated harness for your vehicle. It will have clear instructions and will basically be a unplug and plug type setup. No cutting or soldering necessary. They cost a little more but are worth the extra cost due to the ease of installation.
I got 2005 Toyota sienna and tire size is 215/70/16. I also heard that you can install 225/70/16.
The following link has instructions, diagrams and pictures showing how to make this repair easily and inexpensively: http://www.findonefindall.com/toyota-sienna/siennareardoor.htm
Its on the back bumper if you don't have one you would have to purchase one and the connect it under the back bumper.
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If don't already have the speakers, go to Crutchfield.com. They are competitively priced and include very detailed instructions with great pictures of how to install everything they sell. They also include all wiring harnesses you need. It is just plug in everything. No splicing and connecting wires. They also have a 1-800 number for customer support. I buy all of my audio stuff from them.
i had same problem. was an electrical short caused by an aftermarket trailer light cable. once removed it worked fine.
The 2001 Sienna MAF is on top of the Air filter box on the driver side of the engine. It is mounted with two screws and has an electrical harness attached to it. It could be replaced in less than 5 minutes using only a screw driver.
To replace the front speakers in a Toyota Sienna the door panels must first be removed. With the door panels removed the speakers will be easily accessible and the mounting screws can be loosen. Unplug the speakers and remove them. Install the new speakers.
Copy and paste this URL into your Web browser for a video and instructions from 3M: http://www.3mestore.com/xc003869382.html
Sienna Miller's birth name is Sienna Rose Miller.
Sienna Guillory's birth name is Sienna Tiggy Guillory.