It's just a 3.5mm headphone jack
I meant the connection IN THE BACK of the unit
what year & HU? if u want it for ipod charge/input, one of these links may help--- http://www.toyota-4runner.org/audio-electronics/80539-aux-input-jack-install.html http://www.toyota-4runner.org/4th-gen-t4rs/42036-ipod-interface-aux-input-well.html 2007 2008 Toyota 4Runner Radio Ipod Aux input Cable | eBay Installing Ipod in 4RUnner with JBL [Archive] - Toyota 120 Platforms Forum Fits several models<br>See Product Description IPOD INTERFACE Installing Ipod in 4RUnner with JBL - Toyota 120 Platforms Forum