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Old February 17th, 2005, 01:26 PM   #1
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Relay/switches for SNHOND3 Adapter

I have a SNHOND3 adapter so that I can listen to an AUX source in my factory speakers without the use of an FM modulator. It has a bus cable where it plugs into the Bus Cable 2 Port (for factory XM radio equipped Accords). Whenever I have this SNHOND3 box plugged into the bus cable, I hear a high-pitched whining noise that only gets worse when I turn on the engine to the car and even accelerate. I've tried a GLI and even repositioning the adapter, but to no avail. I've noticed that whenever I separate the bus cable from the actual box, there is no background noise whenever I listen to XM. I thought about adding a relay or nine switches so that I can eliminate this noise. I would need a relay that would handle nine inputs (just like the nine wires in the bus cable), or nine separate switches. What kind of amperage/volt rating switches do I need? If I can accomplish this with a relay, then what type of relay should I get, where can I get it, and how do I hook it up?

I've attached a couple of photos at www.imagestation.com of what this adapter and bus cable look like if you don't already know what they look like.

http://www.imagestation.com/album/?id=2131131082
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Old February 17th, 2005, 05:14 PM   #2
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What are you trying to listen to through the soundgate unit, ipod, other mp3, etc...?
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Old February 17th, 2005, 09:04 PM   #3
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What are you trying to listen to through the soundgate unit, ipod, other mp3, etc...?
I have a DVD/mp3 player connected to this adapter.
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Old February 17th, 2005, 09:22 PM   #4
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if you have it powered through the car, that is whats causing the whine, GLI isnt the best all the time. If you can, hardwire it, and give it, its own ground instead of lighter? Thats if youre using the lighter socket.
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Old February 18th, 2005, 10:31 AM   #5
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Originally Posted by Kingof3rdinput
if you have it powered through the car, that is whats causing the whine, GLI isnt the best all the time. If you can, hardwire it, and give it, its own ground instead of lighter? Thats if youre using the lighter socket.
The SNHOND3 adapter isn't powered on its own. It's just a straight through audio adapter (I think). There are no wires to hard wire or hook up to a cigarette lighter. I don't think that you can even ground it. The only wires that are coming into the SNHOND3 "black box" is the bus cable, and that cable has all the wires necessary to make the thing work from the stock headunit.

The whine isn't THAT bad. I just hear it when I listen to the comedy channel and when I'm switching XM stations.

Got any other ideas how I can fix this?
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Old February 18th, 2005, 01:09 PM   #6
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i think he was talkin about ur dvd player...it might be a bad ground on that...bad ground noise will cause a whiney sound or whatever.....and sometimes gets louder as the alt is turning more, as in the engine reving.
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Old February 18th, 2005, 05:50 PM   #7
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i think he was talkin about ur dvd player...it might be a bad ground on that...bad ground noise will cause a whiney sound or whatever.....and sometimes gets louder as the alt is turning more, as in the engine reving.
Right now, I still hear the sound when nothing else is hooked up to the SNHOND3 adapter "black box." Even when the engine is off, I hear the sound. It's only on XM radio that I hear this sound. It's weird.
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Old February 18th, 2005, 09:33 PM   #8
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I'm 99% sure its a bad ground, it doesnt have to be the box itself or even satellite, but that aux input is the most clear signal going in there, so when its silent, the whine is deafening. I had the same problem. Accord03's right, i was talkin bout the dvd. For sh*ts and grins, try using something battery powered in there, see if the whine goes away, unplug all foreign power sources, radar, dvd, mp3, etc.... See if this corrects the problem.
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Old February 19th, 2005, 09:40 AM   #9
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I'm 99% sure its a bad ground, it doesnt have to be the box itself or even satellite, but that aux input is the most clear signal going in there, so when its silent, the whine is deafening. I had the same problem. Accord03's right, i was talkin bout the dvd. For sh*ts and grins, try using something battery powered in there, see if the whine goes away, unplug all foreign power sources, radar, dvd, mp3, etc.... See if this corrects the problem.
I did try the battery powered little mp3 player that I had. But I still had the same whining sound whether or not that mp3 player was plugged in. No matter what I plug into that SNHOND3 "black box", I still get the sound. As soon as I unplug the "black box" from the bus cable, the sound goes away.

I went to two separate Radioshacks and they didn't have nine small switches of the same kind that I could buy (to splice inline of each of the bus cable wires). I'm getting kind of frustrated. What if I tried another GLI?
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Old February 19th, 2005, 10:14 AM   #10
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I have the same adaptor on an 03 accord... I am using it to run my delphi xm. I had the alternator whine that you are referring to (goes higher pitched w/ engine speed). Use a GLI and then try to take the signal ground and try grounding the signal ground to the car chassis. If you take the outside part of the rca cable on the input side of the SNHOND3, try grounding it to the chassis. If that does not work, try using a "choke" on the hot side of the mp/3 player. basically it is like a diode that goes from hot to ground and a small coil. Radioshack should have one, or try logjam electronics on the web. Good Luck.
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Old February 19th, 2005, 11:36 AM   #11
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I have the same adaptor on an 03 accord... I am using it to run my delphi xm. I had the alternator whine that you are referring to (goes higher pitched w/ engine speed). Use a GLI and then try to take the signal ground and try grounding the signal ground to the car chassis. If you take the outside part of the rca cable on the input side of the SNHOND3, try grounding it to the chassis. If that does not work, try using a "choke" on the hot side of the mp/3 player. basically it is like a diode that goes from hot to ground and a small coil. Radioshack should have one, or try logjam electronics on the web. Good Luck.
So if I buy a GLI from Radioshack and use that, what part of the input are you referring to? There are left (red rca cable) and right (white rca cable) rca inputs to the SNHOND3 "black box". Are you saying that I need to cut one of those rca wires, use the outside portion of that wire and ground it to the chassis and that should work?
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Old February 19th, 2005, 12:02 PM   #12
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Originally Posted by gatrhumpy
So if I buy a GLI from Radioshack and use that, what part of the input are you referring to? There are left (red rca cable) and right (white rca cable) rca inputs to the SNHOND3 "black box". Are you saying that I need to cut one of those rca wires, use the outside portion of that wire and ground it to the chassis and that should work?
You don't necessarily need to cut the cable. Try using a jumper from a good ground to the metal portion of the RCA the (outside) not the center post. If that works, then you can cut the cable. and solder on to the outside (ground) and connect it to chasis ground. I hope this works buddy.
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