my buddy has an xa with the upgraded pioneer head unit, but we have no idea which wires are high freq. outputs i've tried to decifer the diagrams but i'm getting nowhere could someone help? -thanks zach

 

You can can install an amp on the factory HU, I know because thats how I did mine. The audio output is all High Freq(there are no line out signals like on aftermarket HU). What you will need is an LOC(Line Out Converter) that will convert your speaker level signals into a signal that wont hurt the amp. then just plug everything in and your set.

If you haven't already seen it, this is a good guide for find the wires you need to tap into on the stereo harness. http://www.installdr.com/Harnesses/Toyota-Wiring.pdf

If you need anymore info let me know.

 

I have locs that well work for you aplication to install an amp to the factory radio.

 

will you still be able to use ipod function's with a line out converter?
where can i find one?

 

yes, you can still use the ipod functionality with the LOC. I got mine at Fry's Electronics, if you dont have one of those around look for a Car Toys center.. Pep Boys MIGHT have it but dont hold me to it. if your just hooking up some mono(opposite of stereo) subs you only need a small 1 or 2 channel LOC. I have the PERIPHERAL SVEN2($30) LOC, its a good brand and I havent had any problems so far.

 

thanks guys. we appreciate it even though i'm a mazda guy

 

Yes all you need is the LOC, it got a Tsumani on from eBay for $6