2004 Avalanche w/Bose system
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=25331
Printed Date: April 19, 2024 at 11:28 PM
Topic: 2004 Avalanche w/Bose system
Posted By: Haldol
Subject: 2004 Avalanche w/Bose system
Date Posted: January 26, 2004 at 9:24 PM
Bose system... wanting to keep the factory radio, just add sub. Anything special about taking the factory radio out to get behind it to connect the step-down (LOC) to it? I was planning on putting in the equivalent to a SNI-35 on the rear output of the radio. That should work, eh?
Replies:
Posted By: bberman1
Date Posted: January 26, 2004 at 9:54 PM
You need to tap in after the factory amp. I would suggest you tap in at the rear speakers.
Posted By: Haldol
Date Posted: January 27, 2004 at 5:43 AM
Posted By: bberman1
Date Posted: January 27, 2004 at 12:57 PM
Your welcome! 
Posted By: ccroadshop99031
Date Posted: January 27, 2004 at 5:16 PM
fyi there is no remote wire the radio is data-bus
Posted By: bberman1
Date Posted: January 27, 2004 at 5:27 PM
Thanks ccroadshop99031 for reminding me, your vehicle is equipped with a class 2 data bus system https://www.velocitymotorsport.com/install_notes/OBDII.htm you do not have a switched 12 volt at the radio or factory amp. You will need to tap into the pink wire in the ignition harness to supply the aftermarket amp with a remote turn on lead. Other then that it will be a typical install.
Posted By: customsuburb
Date Posted: January 27, 2004 at 5:27 PM
If you use this from PAC : https://www.audiowarehouse.peachhost.com/ct_PR34080345.htm you can get a full range signal incase you wanted to send it to a crossover or an amp for aftermarket front speakers also.
Posted By: Haldol
Date Posted: January 27, 2004 at 8:49 PM
Now that product is something I've never seen before. What about tapping into the speaker wires at the rear speaker (after the amp) and using an SNI-35 step-down to do the signal? That product looks like something I would use if I was going to pull the radio. The gentleman wants to keep the radio intact and doesn't ever plan on changing it out... so even more of a reason to not even mess with pulling it. -------------
Posted By: customsuburb
Date Posted: January 28, 2004 at 5:49 PM
If you tap into the rear speakers or front ones also you will get a signal that dosnt include any low frequencys. Thats how it is with most 2000 and over suburbans yukons and pickup trucks from GM. You will need something like the PAC and im pretty sure it works with the factory radio because in its description it lists using it with the factory radio to get an output that avoids boses external proccesing unit I think.
Posted By: Haldol
Date Posted: January 28, 2004 at 10:13 PM
Well that sux but now that you mentioned that, I remember having that problem in a 2000 Cadilac Cetera... Now I know why... thanks for the input! Now if i can find the interface for cheap. -------------
Posted By: Haldol
Date Posted: January 28, 2004 at 10:21 PM
Is that the only part I need? I noticed on the site: https://www.audiowarehouse.peachhost.com/ct_PR34080345.htm that if the vehicle isnt listed, you will need several other parts too. this is a 2004 avalanche and I don't see it listed. -------------
Posted By: Haldol
Date Posted: January 28, 2004 at 10:53 PM
After looking at that PAC product closely, all it is, is an SNI35 look-alike that's installed right at the radio instead of at the speakers. I think that will work and I will try it (not to conflict with what ppl have told me). I will report the results when I get them.
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Posted By: Haldol
Date Posted: January 29, 2004 at 6:08 AM
Besides the obvious appearance of the interface and the fact that it comes with the harness attached, what is the difference between the basic functions of the PAC C2A-GM24 and the PAC SNI-35? Now: for those of you who have replied to my previous posts about the 2004 Avalanche, I am not ignoring what you stated. It's just that the more that I look at a picture of the GM24, the more it looks like an SNI-35 simply tapped into the audio output leads of the radio before the signal hits the factory amp. Both modules appear to be adjustable and have the RCA outputs and speaker level inputs. It seems that you could just mimic the GM24 with an SNI-35 by tapping into the factory audio leads right behind the radio. Someone had said when I commented on tapping at the speaker to get a signal for an SNI-35 (for the purpose of adding a sub amp to a 2004 Avalanche) that if I did that, I would get a signal with no low frequencies. That seems logical however, b/c the signal has already been processed by the Bose amp which I would think would no doubt have crossover protection built in. Shouldn't the signal from the radio however, be full range? -------------
Posted By: Haldol
Date Posted: January 29, 2004 at 8:30 AM
I need to know what the wiring diagram is for a 2004 Avalanche with Bose. Our database here on the site doesn’t have it. Any takers? -------------
Posted By: bberman1
Date Posted: January 29, 2004 at 10:45 AM
With the C2A-GM24 it plugs into the back of the radio, but if you were to use the SNI35 you would need to tap in after the factory amp.
Posted By: Haldol
Date Posted: January 29, 2004 at 10:58 AM
Well, as a lot of you can see, I have posted many time about the 2004 Avalanche and about whether an PAC SNI-35 will work in the place of the PAC C2A-GM24 interface when you want to add an sub amplifier to a factory Bose system. It occurred to me (as most often the case) that I could try to call PAC about this and see what they think. So, I did… and the result is surprising! Just as in the days of old when you had to add an amp to a 1991 Cadillac, the same thing will work here. Instead of buying that $75 to $120 harness to do the job, you can do it now with a $15 SNI-35, tapping into the audio leads behind the radio, before they get to the amp… or so the guy at the PAC tech support told me (1-800-854-3133 for PAC and tell the lady you have a tech question). So, I hope this helps others as it did for me. I will post the results of my work after I do it tomorrow. Now, if I can only get some wiring colors! -------------
Posted By: rbbrink
Date Posted: January 29, 2004 at 7:26 PM
If the Avalanche system is the same as the Sierra when the rear tuner/headphone jack is activated it turns the rear door speakers off. Hooking your LOC to them might not be something you want to do. If you have read any of my previous posts you will notice I had trouble doing a similar install on my '04 Sierra, but I think I have it figured out. I hooked my LOC to the factory sub wires coming out of the amp (Light green -, Dark green + on one side and Grey -, Tan + on the other) these wires are twisted pairs so not to confuse them with others. The pink wire seems to work for a signal. The PAC stuff looks nice but it is a little pricey for me,and you need four different pieces, I just used the $15 one. And if the location of components is the same all the wires you will need to access are under the big poket in the center console, just remove it and you can seen the amp and all the wires with plenty of room to tuck stuff and no need to pull the radio.
Posted By: customsuburb
Date Posted: January 29, 2004 at 7:30 PM
The $15 one sounds fine. I think the overly expensive one I showed you was just if you didnt want to cut up your factory wiring harness.
Posted By: customsuburb
Date Posted: January 29, 2004 at 7:32 PM
The $15 one you mentioned sounds fine. I think the one that was overly priced was just for people who dont want to cut up thier factory wiring harness like you said.
Posted By: buslar
Date Posted: February 02, 2004 at 12:36 PM
Why go through all this. When I do the GM systems with Bose radios I just go to the factory sub and grab the signal there. it works for me. Good clean signal and you retain all your original controls. Power is the only problem. Easiest way is to use sub amp with auto shut off. These are great factory systems they just need a little more kick.
Posted By: Fosgate3
Date Posted: February 02, 2004 at 2:11 PM
There may not have been a factory sub in the vehicle, so in that case, wouldn’t the only option be to do the SNI35?
Posted By: customsuburb
Date Posted: February 02, 2004 at 6:48 PM
Their is usually no such thing (yet) as a good sounding Factory sound system unless you like your sound to have muddy bass and muffled highs. And forget about deep bass extension. The deepest bass your gonna hear in a car or truck with a factory system if your engine rev.
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