As of February 2015, wiring diagrams for several different types of Pioneer radios are available on sites such as Custom Autosound, found at CasMfg.com. There are also many different wiring diagrams for Pioneer radios found on TehnoMagazin.com.
Users will need a PDF reader, such as Adobe, to view the diagrams found on CasMfg.com. In addition to Pioneer diagrams, the Custom Autosound website also has diagrams for Kenwood and SecretAudio sound systems. The diagrams on TehnoMagazin.com are directly on the website and include such models as the Pioneer KEH-1010QR, the KE-1900 and the KEH-2500R. There are also photographs specific to several car models, including Acura and Lexus.