Installing Sub and Amp With Factory Head Unit

[BlueCollarCowboy]

Hey there,

 

I have been researching the best option to install a sub and amp on a factory head unit, so far the only thing I have found is to use a LOC however I would rather not splice into factory wiring if possible. I would be installing an aftermarket head unit later on down the road but due to recent layoffs at work I have taken a pay cut and would like to do this for cheaper than buying a new head unit at the moment. 

 

In doing some research I found that at least with Ford vehicles there is a model that goes in line with the head unit wiring harness that would provide the outputs that you would need to send the bass feed to the amp via RCAs or Optical cable. Does anyone know if this is something that is on the market for a 2012 GMC Sierra and if so where could I pick one up? If my only option is using a LOC I can get a good one at my local Walmart that has a 12V turn on wire built into the unit Scosche LOC2SL Line out Converter with Bass Control.

 

Any input would be great.

 

Thanks

[EastTNChevy]

I put a sub under my rear seat in my 2008 Silverado with factory head unit. I ended up using the same LOC you did (bass control knob Is nonfunctional on mine). If your amp has high inputs you can splice into the wires at the back of the head unit to get all 4 channels and run them back like you would RCA cables. But even though I thought I knew what i was doing, when I pulled the head unit out and saw the multiple plugs I lost confidence in that plan (couldn’t find reliable information on what is what) and just tapped the door rear speakers harness in the pillars. That’s the best I could come up with it, works fairly well.