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High Pitched whine when using line out with car power adapter

When I use the XM2GO line out into my car stereo line in, it works fine as long as I run it off of the XM2GO internal battery. If I connect the car power adapter, I get a high pitched noise at a level that competes with the level of the audio. It doesn't make any difference if the car engine is on or off ... same problem either way. I even get whining noises with the XM2GO turned off as long as the car power connector is plugged in. I didn't have any problem with the home kit using the external power adapter and the line out to amplified speakers, but using the car power adapter seems produces the high pitched noise which renders usage unacceptable. Any thoughts ?

Posted by Mark William on

  • philbert396 Dec 09, 2007

    I have noticed the same problem with my XM2GO power car adapter. This happens with the ignition turned completely off. The problem has to be in the car power adapter. I am going to take it apart and add a capacitor (filter) to the output and see what happens. Looks like the unit is glued together, of course.

  • Anonymous Mar 30, 2008

    i have the same issue. the car adapter works perfectly, except if the power adapter is on, then i get that high pitched whine. pioneer tech support told me to take it back. i did, and the replacement car kit has the same problem. i then went to radio shack and bought two ferrite coils and attached one to the line out cord and the other to the power cable. that didn't help either. also noticed the issue with the car off and on. also, my car is a toyota prius (hybrid) which i think does not have an alternator.

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I was ready to mention the car's alternator but you say the noise is there if the ignition is on or off. What type voltage adapter are you using? It sounds as if it's the culprit. If it's an inverter I could understand the noise being generated. Have you tried earthing ALL the components involved? Earthing problems can cause some mighty weird things to happen.\ Are you sure nothing else in the car is switched on? eg. another radio or something with an inbuilt oscillator. Try running the power for the adapter straight from the battery and put a noise filter in line. Are you turning the engine off but leaving the ignition switched on? Doing this can cause a noise from the fuel pump. Oh and make sure the antenna is correctly earthed. Apart from that, I'm stumped BMW

Posted on Jul 18, 2006

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