The Install Doctor offers car radio wiring diagrams at Installdr.com. Free car wiring diagrams are available for the Honda Acura, Volkswagen, Toyota, Nissan and Infiniti. Diagrams can also be found for Isuzu, Mazda, Ford, Lincoln and Mercury models, as well as for Dodge, Chrysler, Plymouth and Jeep vehicles.
Autotoys.com provides a comprehensive resource of car wiring diagrams, and people can make requests for any diagrams not on the website. The site has the car wiring diagrams for Neon, Subaru, Mitsubishi, the 1996 and 1997 Pathfinders and Daihatsu vehicles, as well as for Hyundai. Jaguar, GMC trucks, SAAB and Maxima. In addition, wiring diagrams for Lexus and BMW are available as of August 2015. An on-site store lets people purchase any wires they need.