For Highlander Hybrid owners who want to do-it-yourself with repairs, listed below are a few links that may provide the help you need. For hard core DIYs, it might be a good idea to purchase a Haynes or Chilton manual that will answer most any repair question.
Also, because of the commonality with conventionally-powered Highlanders, owners with 2008+ hybrids should visit the 08+ Highlander forum's Modifications & Maintenance sticky, as well as the Common Problems & Solutions sticky for additional information. It's well worth the look for issues other than hybrid drivetrain issues.
Hybrid Specific Information:
Audio and Navigation Schematics *Special thanks to
Ewaybevinn for providing us with these schematics!
Hybrid Vehicle Maintenance from About.com
Hybrid Car Maintenance from AllHybridCars.com Be sure to check out the links on the right side of the page.
Offsite Link To Engine Temperature Hack To Improve Mileage Thanks to
JSTCD for providing the link and details about the hack in
this thread.
ScanGauge Codes (all known ones) for the 2006 hybrid but that might be applicable to other hybrid model years and other Toyota models too. Another special thank you to
JSTCD for providing the document!
Maintenance Information:
Autozone is also a great place to start. This site has mechanical and electrical repair information for 2006 and earlier Highlanders. The wiring diagrams alone can be a great aid for do-it-yourself work.
Does your vehicle have an interference engine? Click here to check whether your Highlander (or other vehicles) have an interference engine. Just plug in your vehicle information and the "Comments" section in the results will tell you if it's an interference type, plus supply you with other pertinent information regarding replacing your timing belt/chain.
Free Car Fault Codes Got a fault code that you'd like to know what it means? This free web site offers a simple and easy way to get information about your fault code. You can also
click on this link to view a list of OBD-II trouble codes.
OBD Port Location (picture provided by thaddeus)
Tire Size Calculator Great when seeking information for what happens when you change tire size.
Toyota Parts and Service This site provides scheduled maintenance requirements, and also provides service support links.
Toyota's Technical Information System contains all of the product support information necessary to maintain, diagnose, and repair your Highlander. TIS is offered on a subscription basis, so see the site for more information.
Vehicle Bolt Pattern and Offset Reference
Miscellaneous:
Etrailer provides hitch installation, typical wiring diagrams, hitch rating info, and other information to help you with trailer hitches.
How Does The 4WD System In My Highlander Work? An excellent instructional video from Toyota. Thank you to
R00K for the find!
Tips, tricks, and suggestions by long-time owner
Tydog07 located here for those who want more insight into their Highlanders.
Parts:
AMSOIL Online Product Application Guide Need to know how much oil or fluid it will take when working on your Highlander? This excellent reference will give you that information and more, such as wiper blade part numbers or filter information. Check it out!
Battery Group Size Chart for when your battery goes belly up and you want to replace it.
Reference Source For Belt, Hose, And Hydraulic Work (see the "Popular Topics" sub-menu for quick links)
ToyoDIY Parts Reference provides parts information for any model of Toyota. It provides helpful, detailed information when ordering parts and is based on searching via you VIN number or frame number.
Vehicle Information:
AboutAutomobile is a great web site for finding out information on your vehicle, such as TSBs, safety recalls, consumer complaints, and much more! A site worth checking out. Special thanks goes to
IBME for recommending this web site.
Online Toyota Maintenance Guide: Have you lost your owners manual or would just like to check on your vehicle's required maintenance information? This scheduled maintenance guide is a fast way to check it out.
Toyota Guide If you have questions about some of the features on your 2007 Highlander (sorry, they only cover 2007 and following years) then this site can help you with basic features like the key/fob, instruments, or controls. Toyota Guide has video demonstrations and interactive links that can answer some of the questions we owners may have.
Toyota Reference: A Collection of Vehicle History and Specifications is a great resource with helpful information about your Highlander or other Toyota. Thanks to
scionlife for the site and link.
Send me a PM if you have a link/information that is generic for Highlander Hybrids that might be added to this thread. Any suggestion is welcome. Thanks, and check back occasionally for updates to this thread.
TrailDust 
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