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You won't ever. They make a universal harness. You should have a wire harness for your new radio only that was included with the radio. It should plug into the new radio and the other end will just be wires. Then you will need to go to a parts store, ( AutoZone, Oreilly's, Advance Auto, Etc) and but a radio wire harness for your truck. It will have a connector or two that plug into the harness that plugs into the back of your stock radio and the other end will be just wires. you will then connect the two harnesses together by matching wire color. ( EG: Purple to Purple, Gray with black stripe to Gray with black stripe, etc)
YES.... to prevent cutting of any factory wiring (this use to be the old install method and requires much more time and expense) and potential electrical fires, you can now buy quite cheaply, what is called a Radio adapter harness.
As you wish to install a Kenwood radio to your Toyota Scion, simply buy an adapter loom which has a 2005 Toyota Plug on one end, with a Kenwood plug on the other (this essentially replaces the wiring loom that came with your Kenwood unit).
So, it's that easy .... Plug and Play.
And... if you sell your Toyota and wish to put your old Toyota radio back in, the original radio just plugs back in. PRESTO !
You should have a wire harness pigtail that comes with your kenwood. you can also purchase a harness adapter plug/pigtail at most audio auto stereo shops to fit your car make and model. Be sure to save the packaging because the plastic bag has the color/codes for the harness. This harness is designed to plug right into the factory plug inside the dash just like the stock radios do. All you need to do is splice the kenwood cables to the adapter plug pigtail you purchase for your car. match up each wire as described here: 1994 Buick Century Car Stereo Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′ x 6′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
You will need a wiring harness for the model truck you have, plus a filler kit. The filler kit is what the radio will actually attach to and fill the space left by the factory radio. Follow the diagrams for wiring from the harness and the aftermarket radio. Generally, there are 8 wires to be connected for a four speaker system. In addition, you will connect a ground wire (black), a yellow wire (constant power), a red wire (this is to turn the radio on and off with the ignition), and a solid orange wire (illumination). Because you have a GM product you will also need an antenna adapter. All these things can be purchased at Best Buy, or WalMart.
I would suggest calling or find online Crutchfield. They have been car stereo experts for many years. They sell harnesses for just about any car allowing you to plug in your stereo directly to the existing harness. I guarantee they will know!
No need to guess what wires go where. Buy a wiring harness for your specific year, make and model.
You make connections from your pioneer harness which are all marked, to the Harness you will purchase for your car. They cost about $20 and can be purchased at most autopart stores, or major electronic retailers.
Once you make the connections from the pioneer harness to the harness specific for your car, simply unplug your factory radio and plug in your newly wired one.
Best thing to do is purchase a Radio Wiring Harness. These can be purchased at a Store like Circuit City, Best Buy, WalMart (not sure of your location) or a 12 Volt Specialty shop.
This harness will connect to your new radio harness and plug directly into the vehicle harness without having to cut wires. The Radio Wiring Harness will come with color identification to match to your radio harness.