I've got the 6-CD in-dash changer. On the back of the unit, there's the antenna plug, then the main harness that connects the unit to power and the speakers.

Then there's the empty connection that's smaller than the main harness. What is this for exactly?

 

Pic

 

I couldn't find this thread until today... lol


Here's the pic... it's the unused connection.

 

I can't see the pic great from my phone but when I replaced mine I thought I read that there were some optional connections for things like satellite radio and/or remote start or other stuff. I could be completely off base though, can't remember now.

 

My pioneer head unit has something like that and you can hook up a wire to a 10 disc cd changer, or other accessories. At the moment I have an ipod connected to it used as the aux2. I think on the pioneers it is called a ip-bus. I'm not completely sure if that applies to the oem radios though. Do you have a factory sub and amp with your oem system? If not that could be an extra connection for one of the fancy oem sound systems that wasn't an option on your truck.

 

I second the amp and sub.

 

I am unaware of any amp or sub in the truck.


If I wanted to put this supposed factory amp/sub in, would it make a huge difference with my stock everything? Where would I be able to find it? Link or pics?

 

Some trucks came with this from the factory, like the Tremor sound package. I think you would know it if yours had an amp and sub, it sounds so much better. So that what those connections are probably for. Unless you can find these for cheap, with the oem wiring, I'd say just upgrade your headunit, and then wire an aftermarket sub and amp to that. It'd probably be cheaper in the long run.
I'm sure someone will chime in that knows for sure. My truck came with nothing but a radio, no cd player, and two crappy paper speakers up front. Didn't even have rear speakers.....that set-up lasted about a week before I upgraded.