A wiring diagram is a diagram showing how to wire certain electrical components in this case it would be the pioneer deh 4400. Pioneer s deh 3400ub is ready to roll with direct connectivity to your ipod or iphone for music and video via the optional usb interface cable cd iu51 interface cable sold separately. Pioneer wiring diagram for deh 3400ub answered by a verified car electronics technician we use cookies to give you the best possible experience on our website.