Help w/'02 stock Nissan Sentra head unit

djR1SpecV · 11-30-2005, 11:55 PM

I had a in dash 6 cd changer (part of the Rockford Audio Package) which I removed to make way for an Omnifi; the installation was successful... sort of.

The problem I have is that I'm using the 8 pin din connector form the back of the head unit to feed signal from the DMP1. I figured out the pin out layout and got the left/right signal done.

This is the diagram I'm working with

Pin # 1 (one) is the problem... What signal should I send to this pin so that the Head unit registers that there is something (cd changer, etc.) connected there allowing AUX to be selected? The omnify doesn't have a remote wire.

Please do not recomend an FM Modulator, a new/different head unit, etc.

Thanks -RD-

djR1SpecV · 12-03-2005, 01:34 AM

Please someone... HELP!

99blkprotegelx · 12-03-2005, 01:55 AM

Hi,
In order for this to work, you will need to send 12volts to this pin(postive trigger) or ground that pin out (neg trigger) I would try grounding it out first and see what happends.

djmickyg · 12-03-2005, 02:04 AM

is says its an output.. so im guessing grounding it would work.

djR1SpecV · 12-03-2005, 11:33 AM

I'm sorry guys, I'm kinda frustrated about this that I even pointed out the wrong pin....

The pin I need to feed is pin # 1 NOT pin #2

99blkprotegelx · 12-04-2005, 12:37 AM

Do you have a multimeter?

Test the voltage on that pin with the deck pluged in to the factory harness.

use one probe for the pin and the other to ground...its should read around 12volts. if so..this is a negitive trigger and grounding it pout should do the trick.

djR1SpecV · 12-04-2005, 01:37 AM

Quote: Originally Posted by 99blkprotegelx

Do you have a multimeter?

Test the voltage on that pin with the deck pluged in to the factory harness.

use one probe for the pin and the other to ground...its should read around 12volts. if so..this is a negitive trigger and grounding it pout should do the trick.

Thank you for the response, there is no measurable voltage coming from that pin as this is a "signal in"

I was able to feed it 12v from the same source that is providing the ACC 12v to the OMNIFI, however, once I do that, the head unit only works in AUX (in) mode. I won't return to radio nor CD.... I have to interrupt the ACC 12v for the head unit to return.

So if i connect a "normally open" relay there it should do something.... right?

Any thoughts?

99blkprotegelx · 12-05-2005, 02:46 PM

Quote: Originally Posted by djR1SpecV

Thank you for the response, there is no measurable voltage coming from that pin as this is a "signal in"

I was able to feed it 12v from the same source that is providing the ACC 12v to the OMNIFI, however, once I do that, the head unit only works in AUX (in) mode. I won't return to radio nor CD.... I have to interrupt the ACC 12v for the head unit to return.

So if i connect a "normally open" relay there it should do something.... right?

Any thoughts?

N/p, you will need 2 relays...I'll post a diagram in a few mins.

99blkprotegelx · 12-05-2005, 03:27 PM

Here's a diagram to download.

http://ca.pg.photos.yahoo.com/ph/mik...nm=14a9re2.jpg

The relay on the Omni fi ground wire grounds out when the omni fi is switched on, this causes the other relay to send 12 volds to the aux trigger on the sentra head unit...The head unit is now controlled by the omni fi, so turning the omni fi off will allow you to use your radio/cd..

I would recommend this set up for a ground over 10A..but the Omni Fi is 7.5A so it shouln't be a problem.

Questions, let me know.

btw, relay harnesses will help as I labled the wire coloring.

99blkprotegelx · 12-05-2005, 10:41 PM

hey , is pin #2 a negitive out put trigger, when you switch btween radio, cd..etc?..if so I can make it much more simple

djR1SpecV · 12-06-2005, 11:28 AM

I'm not sure, but I think when I tested it showed +12v... actually I connected the OMNIFI acc lead to pin#2 and It would turn on when the head unit turned on, kinda like a remote on.

But then, if you have the head unit go through the cycle it wouldn't select AUX because it would interrupt output through that pin (#2), so the loop would be naturally broken.

Does it make sense?

99blkprotegelx · 12-06-2005, 10:11 PM

Quote: Originally Posted by djR1SpecV

I'm not sure, but I think when I tested it showed +12v... actually I connected the OMNIFI acc lead to pin#2 and It would turn on when the head unit turned on, kinda like a remote on.

But then, if you have the head unit go through the cycle it wouldn't select AUX because it would interrupt output through that pin (#2), so the loop would be naturally broken.

Does it make sense?

Sounds right...it maybe a +12volt remote turn on for a factory amp.

now that I think of it...not to sure if the relay pack will work in the way I presented my diagram, as the Omni Fi will always have power running through it. you may want to a mount a switch hidden somewhere that will switch 12volts to pin#2..this will allow you to switch to aux....I'll look at your diagram...and try to think of a better solution

99blkprotegelx · 12-06-2005, 10:21 PM

How willing are you to splice open the 8 pin wire from the omni fi HDD to the display plate?..If there is a wire in there that registers +12 only when the face plate is turned on(or registers +12 at with it off and 0 volts with it on)...then we can set up a remote trigger for the omni fi using 1 relay

99blkprotegelx · 12-06-2005, 10:37 PM

There must be a selectable pin from the head unit either - or +...in order for the factory cd changer to be selected.... is pin#2 +12volt output...if so..did you try looping it to pin#1...just think of options........

djR1SpecV · 12-07-2005, 08:41 PM

Quote: Originally Posted by 99blkprotegelx

There must be a selectable pin from the head unit either - or +...in order for the factory cd changer to be selected.... is pin#2 +12volt output...if so..did you try looping it to pin#1...just think of options........

Yeah, I tried looping those two pins but once you do that, the unit shuts off..

Isn't the cable linking the controller and the drive bay a 13 pin cable? Anyways I'm a lil' bit unconfortable splicing that cable...

I'm going to try your diagram and if not I'll use a switch. I had thought about that same idea too... The thing is that right now the Omnifi sound really low and crapy through the head unit, so I probably buy a new one.

I'm torn between the Audiobahn A1200n, the Clarion DXZ8, 7 0r 6; or the Rockford RFX9220 but I've read not too good things about the Rockford...

Whatcha think?

User Name		Remember Me?
Password