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Okay folks, I need a little help here. I've read through a couple threads and have gotten the impression it can be done, but I need details.

I have an '03 350Z with Factory Nav and the NON-Bose stereo system. I'm ready to upgrade, primarily because I want satellite radio and MP3 playback capability. Current phase 1 upgrade will likely be a Sirius ready Kenwood head unit and replacements for the factory speakers.

Problem I'm running into is no one here seems to know how to do a HU install and keep full functionality of the NAV system. I still want it to work (duh) and I want to keep the voice directions with stereo muting. The HU I am looking at does have a stereo mute line.

I've heard that there are some additional steps you need to do to pull this off, but I cannot find anywhere what those steps are.

Does anyone have a detailed step-by-step of this process and list of any additional electronic components needed? Please help ASAP! Trying to get this stuff in before a loooong roadtrip I have next month. Thanx!
 

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There is a great write-up (I think by Skidazzle) buried on the site that is always down. I haven't seen him post in a while, but on 350zfrenzy, Mikey Likes It has the details. It involves a relay between the nav and headunit to get the audio mute function. On mine, I just added an extra speaker for the nav, without using the mute function, as I never liked it anyway, and keep the voice off 99% of the time.
 

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http://www.my350z.com/forum/showthread.php?s=&threadid=11488
thats the thread that outlines how to do it, better go quick before the site goes down again!
here is an excerpt:
ok.. so to that i added an Eclipse CD5442 Headunit, Eclipse 6-disc in-dash changer, kenwood amplified center speaker, more dynamat xtreme for rear hatch, and brushed aluminium trim for radio and nav screen...

aftermarket headunits dont have the ability to accept an AUX in AND switch to it automatically...

so this is what i did....i got the nav voice working through the amplified center speaker because the nav unit actually generates a line level voice output. the next problem was figuring out how to mute the aftermarket radio when the voice comes on so i can hear it... see, aftermarket radios have "telephone mute" inputs, which activate when the input senses ground.

the problem is the stock navigation uses a +9V signal to the stock headunit to tell it to mute the music. what do you do? easy.. you go down to the electronics store and pick up a 6V relay. use the nav +9V signal to trip the relay, and use the normally open to ground, and the common to the telephone mute wire.

so what happens when the voice comes on...? well the radio mutes (with a display of "TEL MUTE") and then the voice comes through the center speaker... when the voice stops, the radio turns back to normal volume .... awesome!!!
 

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and this one:
http://www.my350z.com/forum/showthread.php...ghlight=circuit
For those of you trying to install a new head unit in your Z, but keep the existing factory navigation system, and keep the voice, the info below will work ! THis is what I did, and it works great, just like the factory navigation system does. Keep in mind that you will have to have a Mute capable head unit, and you will have to wire a seperate speaker for the nav voice. A small price to pay for the much better sound you will get out of an aftermarket head unit.

Anyways, here is what I did:

The output of the NAV system is about 7.5-9 volts. This is not enough voltage to trip a standard 12 volt (30A) relay. So, what I did was this. You have to setup a 2 stage system, composed of a transistor and 12v relay, to switch the mute circuit on a new head unit.

Parts I used:
1. Potter and Brumfield 12V Relay (Bosch will work too)
2. TIP31 high power NPN Transistor (Radio shack sells it)
3. Various length wires and crimp-type connectors
4. 1 kohm resistor (1/4 watt)

NAVI-SYSTEM WIRE MAP:
Mute wire from NAVI control to head unit - R/B
NAVI earth ground - B/P
NAVI Voice input + L/B
NAVI Voice input - W/B

Transistor circuit:
All transistors consist of a Base (B), Collector ©, and an Emitter (E). The pacakge will tell you, if you buy it from ratshack, or look online for a datasheet for your transistor. THis circuit will work for an NPN only. A pnp transistor will be wired differnetly, so make sure you get the proper parts !

1. Wire Mute (R/B) from NAVI control to the transistor Base (B) through a 1kohm resistor (Limits the current so you don't fry the TIP31).
2. Wire the Emitter (E) to vehicle ground
3. Wire the collector © to postion 85 on 12V relay

Relay CIrcuit:
1. From 3 above, wire the output of the collector to position 85 of a 12v relay.
2. Wire postion 86 to 12v switched by the ignition (only on when key is on)
3. Wire postion 30 of the 12v relay to vehicle ground
4. Wire positon 87 of the 12v relay to mute input on the new head unit.
5. Position 87a is not connected

Here's what happens:
When the voice control turns on for the navi system, it send the R/B wire high (7.5 volts). This voltage triggers the transistor to open up, and essentially provide ground to the relay. Once the relay is grounded, the relay is energized, and switches the constant ground (suppleid by terminal 30) to position 87, and supplies a ground signal output from the 12v relay. This ground signal MUTES your new head unit. THat's all...simple circuit, great results !

Don't forget that you will have to add a seperate speaker for navi voice under your seat, and run the 2 voice output wires from the navi control to this speaker. If you mount it under the driver's seat, you may have to turn the volume up slightly to hear it...

Good luck, and I hope this helps those who are adding aftermarket headunits to a Z with factory navigation...

One-cool-ee
 

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I just did mine. I measured a full 12 volts and used a 12 volt relay to trip the mute line. Then I used a computer case speaker to do the talking. I'm not overly pleased with the computer speaker, but everything else works great.

PM me for more details...
 

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2003z's method will work regardless of voltage, but it's a lot more complex than necessary. Simply using a 12 volt relay is more than sufficient.
 

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Originally posted by toykilla@Oct 15 2004, 10:09 AM
2003z.. would you mind if i add that to our How-To section?

no, add it if you want, but I didn't write them. just copied and pasted from another site. I didn't wire my mute at all. I would rather the voice be independant of my stereo, so I just have a speaker and listen to both at the same time, when I even use the voice.
 

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OK, I'm a newbie with car stereos and I'm looking to replace my BOSE HU on my 2003 Touring with one of the Alpines that come highly recommended. However, I also have the factory navigation. Crutchfield has explained that I will lose the factory navigation, but if they just mean the voice part, I don't care because I keep it off. Is that the only problem? Assuming I don't care about the voice, do I not need to do any extra work to keep the navigation working? If so, I'm ordering tomorrow. Thanks.
 

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Originally posted by 2003z@Oct 12 2004, 01:54 PM

NAVI-SYSTEM WIRE MAP:
Mute wire from NAVI control to head unit - R/B
NAVI earth ground - B/P
NAVI Voice input + L/B
NAVI Voice input - W/B


What are the meanings of the letters (ie: R/B, B/P, etc.)? Are these wire color codes? If so, can you spell out the colors?
 

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[/quote]
if my memory serves me correctly, and it is going by nissans long running color abbreviations,
red/black
black/purple
blue/black
white/black
 
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