im trying to install my pioneer d3 but im confused because there is more than one harness. which metra harness do i need for my 92 lexus sc400. guy at the shop told me i need the 70-1761 which comes with two harnesses and is for 1987 and up toyotas.. did i get the right one?

 

for got to mention the car had a aftermarket radio in before but the last owner took it out before he sold it to me and i think they bypassed the factory amp because there is speaker wire running though the car..

 

you have to just splice the wire yourself.
http://www.intellexual.net/faq/lexusstereo.swf
Or in short
A2 = orange dimmer
A3 = yellow
A4 = red
A11 = black ground
Also the pink green and pink blue wires need to be cut and wired to your antenna cable.

 

that link doesnt work.. which harness am i suposed to be using? there are 4

 

The search button my friend ,i am not trying to be rude or anything , even on A-L.com they will tell you search first ,it has been done a lot SC guys had replaced their HU.