Satellite wiring issue? - BMW Luxury Touring Community
 
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post #1 of 9 Old Feb 28th, 2013, 5:33 pm Thread Starter
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Satellite wiring issue?

Purchased a 2008 LT with 15k miles in late October and all is well except that I am getting ignition whine thru the satellite radio. The previous owner was very meticulous with the bike and had all options installed at the dealership. So before I go tearing into the great unknown I was wondering if anyone had any experience with this issue. I feel like it is wired incorrectly but was curious where it should be wired into. Thoughts, time and suggestions greatly appreciated.

Kevin Crowley

2008 Black LT "Orca"
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post #2 of 9 Old Feb 28th, 2013, 7:45 pm
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Re: Satellite wiring issue?

I have Sirius on my '05LT, took the power off the front side marker light, no noise. I have a Baehr comm system.

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post #3 of 9 Old Feb 28th, 2013, 7:53 pm
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Re: Satellite wiring issue?

How is the audio getting to the speaker/headset? Is it directly wired using the AUX input or are you using the RF transmitter in the XM radio?

Make sure the antenna wire which is very long is not wadded into a ball. Straighten it out under the handle bar cover or someplace that you can lay it back and forth about a foot long.

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post #4 of 9 Old Mar 6th, 2013, 3:32 pm Thread Starter
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Re: Satellite wiring issue?

It has a removable jack that plugs into the AUX input. The whine is present whether I use external speakers or helmet speakers. Is a XM radio brand. Thanks for the input.

Kevin Crowley

2008 Black LT "Orca"
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post #5 of 9 Old Mar 7th, 2013, 11:28 am
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Re: Satellite wiring issue?

FWIW, I have my extra XM cord coiled up, but maybe I've just been living right....on second thought, that can't be.

You say everything else is find, in that you do not get the same whine from the factory radio?
Just checkin'.

Jeff
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post #6 of 9 Old Mar 8th, 2013, 5:42 pm Thread Starter
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Re: Satellite wiring issue?

Factory radio, cd, etc quiet as a church mouse. Only get the buzzing thru the satellite radio.

Kevin Crowley

2008 Black LT "Orca"
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post #7 of 9 Old Mar 8th, 2013, 11:30 pm
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Re: Satellite wiring issue?

Try a few ceramic rare earth type magnet and loop the cable through them.
They should clean up a lot of the noise...
Its the same type of magnet that is at the end of your VGA monitor cable or computer power cord.

Also try to put a few of these on the power cable that feed the XM if you can.

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post #8 of 9 Old Mar 9th, 2013, 11:53 am
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Re: Satellite wiring issue?

you say "Ignition whine"... is that really what it is? Does it follow engine speed (i.e., as you speed up the ENGINE, does the pitch of the whine change? If the engine is off, is it whineless?

If so, that's often a sign of a bad alternator. The car alternators (how portable this is to the LT, can't say for sure) I've worked with will typically have three sets of windings/diodes, and if one of the diodes or windings is bad, you will get a whine through the audio system, even though the alternator will still put out enough juice to keep the car running indefinitely (though you may have problems when loading it up -- idle, lights on, heated grips, heated seat ... and things might get unhappy quickly should another diode or winding fail)

I'd suggest starting by figuring out where the whine is coming from -- you have two choices, really: through the power or through the the air. Disconnect your sat radio's power from the bike, and power it from "something else" -- preferably a battery. Make sure you ground your "something else" to the negative terminal on the battery of the bike. If that eliminates the whine, it is coming through the power system...start looking at your alternator.

If you still get the whine, it is probably coming "through the air", probably due to something routing near spark wires, ignition computer or similar. At that point, the ferrite beads (not magnets) tvguy mentioned above might help, though rerouting would be my preference. And yes, you can scavenge these things off various cords with big mysterious blocks near the ends. If you hunt, you can get two-piece cores which can be clipped around existing wires without any disassembly. They work by basically turning your wire into an inductor which will actively block higher frequencies. You might be already seeing a problem here -- you have an audible frequency you are trying to block, which is fine if it is riding on a power wire, but if it is riding on an audio cable, you probably don't want to chop out those frequencies.
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post #9 of 9 Old Mar 9th, 2013, 12:48 pm Thread Starter
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Re: Satellite wiring issue?

Thanks for the insight everyone. I will go to work on it.

Kevin Crowley

2008 Black LT "Orca"
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