Guide To Keeping Stock Nav. Voice With Aftermarket Radio Install

[w8lifter21]

With the radio removed, you are looking for the harness that has Blue/White and White/Black wires in it. It’s the same harness that has the speed sense wire in it.(White/Green)



BooYeah!

Already have your radio installed and don’t feel like taking the radio out? Drop the glovebox, look up and the white plug on the left will have the wires in there as well. Careful when dropping the glovebox, I’m pretty sure the bright yellow connector and wire are airbag wires.



Blue/White is Nav. Voice (+)White/Black is Nav. Voice (-)

Strip both these wires and splice speaker wire to them. I think these wires are pre-amped and will have a low output but I haven’t gotten to that point to test them. The car has to go to the dealership to fix a U1000 code. As soon as it’s back, I’ll update the thread.

If it is a preamp signal, and since I already have a sub in the car, I will be using the stock amp(should be bypassed when you installed the aftermarket radio) to boost the signal to the speaker I will be installing in the stock sub location on the back deck. If it’s not, I should be able to run it straight to the speaker.

[bowlofturtle]

seems interesting let me know how this turns out, how much would you charge to do this...since your somewhat local to me =P

[rpm240sx]

So, how did this project turn out? Were you able to keep the voice?

[pfarmer]

So, how did this project turn out? Were you able to keep the voice?

While the post is old what I feel is missing is that the nav voice seems to be a balanced output which is applied to the stock amp for use for the right and left front channels, at least based on the FSMs I have looked at. To work correctly and to protect the nav unit these probably should be isolated from the new after market amps rca style inputs which have one side grounded.

Here are a couple of links to explain this:

http://www.allaboutcircuits.co....html

http://www.installer.com/hilo/

http://www.installer.com/item/...SVEN4

http://www.installer.com/item/...SVEN2

http://www.installer.com/item/...SVENR

The first will give you an idea of what opto-isolation is about.

The rest have descriptiosn that are not as detailed as I would like but seem to point to what is contained within them. That is they speak of balanced inputs which is what the nav appears to output and of isolation between the in and out.

Another thing to look at would be a headphone preamp. Some of these are designed to take multiple inputs and put out one output and are differential amplifiers using opto-isolators.

So from what I see, if the 2 channel version about that speaks of balance to unbalance basically what you most like would do would be to connect the input side to one of its input channels and use one of the outputs to your new amp. On the input side if the negative side of the input is in fact isolated from the outputs rca ground side and also the ground connection of the device then it may well be a packaged unit for what you are looking for.

I would suspect that Car Toys or maybe even Best Buy actually has something similar but I also suspect many of these types of shops really don't understand them. They work for connecting factory head units which use an external amp to an after market amp of your choosing and that is what they understand. The next time I am at one of these shops and maybe RShack I will take a look as I have a project of my own I am considering.

But in the case of the nav voice you are in front of the total audio connection which has also combined cd changer and other common car audio signals which is slightly different.

Perry