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Discussion Starter · #1 ·
Just picked up my 07 Black Mica 3 5-door the other day. I love it so far! I've got the factory Bose system. As I've been messing around with the AUX in, I noticed that when my external Sirius InV tuner (which I had previously used the internal FM tuner in my old car to play on that one's stereo) is plugged in through the AUX in, there's a ton of hissing static (which is really noticeable once the volume is up to about 13 or higher). If I plug my iPod through the AUX in, no such trouble. That is crystal clear.

The one thing I noticed this morning, is that as soon as I plug the power in from the Sirius to either the cigarette lighter adapter or the power plug near the AUX in, and leave the Sirius off while set to the AUX input, I can hear the hissing. So it almost seems like some kind of feedback issue between the power and the AUX in? Maybe?

Anyone else ever have this problem? Any thoughts on what, if anything, I can do about it?

Thanks in advance...
 

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That's a common problem with the 3. It's called a ground loop, and it happens when you have a device plugged into the Aux jack *and* getting power from the power socket. Your iPod doesn't do it because you didn't have it charging from the power socket, therefore a ground loop can't form.

Luckily, there's an easy fix. All you need to do is go to Best Buy or Crutchfield or a similar store and buy a ground loop isolator. It'll plug in between your audio source and the aux jack and filter out the noise.
 

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Discussion Starter · #4 ·
Awesome...thanks for the advice!!

I'm grateful for such a forum...I'm sure this will be a great resource as I learn more and more about my new 3!!

Thanks again!

--Jim
 

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hey guys, I have the same problem as boiler with my XM receiver with aux input. I have the xm powered with a hardwire connection instead of cig lighter. Crutchfield sent me a GLI but I still hear the static when using it. Tried mp3 player on batt, no noise. Is it posiible the GLI is bad because everyone else seems to solve this problem using a GLI? Thanks for the help
 

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kman, are you still hearing the alternator whine (sound that changes in reference to the rpm), or are you just hearing static? How bad is the static? Is it possible you're hearing noise from the satellite radio itself? Where is your antenna mounted? Have you checked all of your connections to make sure they're sound?

That's all I've got right now. :p
 

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when I used the cig lighter adapter I got the whine but after switching to the hardwire kit, whine disappeared. I'm only hearing static when the car is on. Its not too noticeable with the volume up listening to music but you can definitely hear it on talk radio or comedy channel. I'm pretty sure its not the xm unit. My antenna is on the back left corner of the roof. Its not the aux cable since it sounds fine with the mp3 player. Forgot to mention I have a Pioneer DEH-7800MP. Thanks for the reply icspots
 

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[quote author=kman5574 link=topic=71429.msg1363916#msg1363916 date=1177517547]
when I used the cig lighter adapter I got the whine but after switching to the hardwire kit, whine disappeared. I'm only hearing static when the car is on. Its not too noticeable with the volume up listening to music but you can definitely hear it on talk radio or comedy channel. I'm pretty sure its not the xm unit. My antenna is on the back left corner of the roof. Its not the aux cable since it sounds fine with the mp3 player. Forgot to mention I have a Pioneer DEH-7800MP. Thanks for the reply icspots
[/quote]

Where did you get your power from your hardwire kit? How is it wired up? The static you're getting could just be interference from some other power source (like when you run the power and signal wires for an amp right next to each other) or you could have a bad/loose ground.
 

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for the hardwire kit I tapped into the cig lighter, the ground is connected to the bolt on the e-brake if I remember correctly. I messed around with wiring straight to the fuse box but it made no difference. I tried a few different spots for ground but they all resulted in static. I figured the e-brake ground was solid but maybe not. I have no amp or sub installed. My issue is just like boiler1111 described.

Boiler did you have any luck with the GLI?
 

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You could try tapping into the ground on the cigarette lighter as well. I isntalled a starmate in a friend's 3 and tapped the power from the 12v hot to the cigarette lighter and the ground from the lighter's ground. No hissing sounds at all.

Are you still using the GLI with your hardwired setup?
 

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I originally tried grounding to cig lighter, same thing. I'm not using the GLI, I got fed up and have just been using the FM modulator. I've tried everything and I still get the static. Just makes me wonder when everyone else says the GLI helped but not in my case. I checked on the way home, even with power to the roady off and car on, radio set to aux, I'm getting the static. I even tried a power filter, no luck.
 

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ok, messed around with it last night. GLI didn't help at all. If I unhooked aux cable from roady and left it plugged into back of head unit, no static. When I did this with the GLI I got static. Not sure what that means but just something I noticed.
 

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yeah i have no idea, very frustrating. I'm wondering if the GLI is bad.
 
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