I just bought a new audio system for my son's car (a surprise) and have an XMXpressR unit on my dash, wired somehow into the back of my CD player. To play the CD, a volume of 20 is fairly loud. To play the XM, we have to crank it up to 50 for it to sound good. Do I need to take it back to get fixed or is this how they usually work? Maybe I should have had them put the XM directly into the CD player.
This sound level problem is caused by oxidation forming in the electric connectors of the XM radio. I have tried several deoxidizers. Only one works really great. It is called, Caig DeoxIT. Here is a link to a good place to buy Caig and in the proper size too! [link].
Spray Caig DeoxIT into and over the connector and allow the deoxidizer to work for a few minutes.
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The stations you set it to have to be complete static for the xm to come in. Your best bet if you head unit has an aux input is to buy an aux cable(few dollars) and hardwire it. it will give you the best quality for sound for xm.
Find a wiring diagram for the audio system in your car (the ones in the Haynes Repair Manuals are excellent). That will tell you what each of the wires sticking out of your dash is. The wires sticking out of the back of the new radio should be labeled, if not, consult the installation manual. Hook the wires from your radio to the corresponding ones in the dash, and you're done!
N.B. It also helps to have a voltmeter to determine which of the wires are hot.
I have had this problem at least a half-dozen times, and the simplest solution is to pull the 2 fuses labeled 'audio 1' and 'audio 2.' It resets the radio, but it will work for a while after that (until I have to do it again). Had the xm unit replaced 3 times, new antenna installed, replaced the antenna connection wire - it always dies within a month.
Remove the Audio Fuse and then put it back in and the problem is solved. So frustrating that I had to find this solution on another site as both the dealer and XM had no idea how to fix it. Dealer tried to tell me it was a bad radio and I'd have to get a replacement from Hyundai.
Those measurements are a standard single DIN automotive radio.
You need to find a "XM ready" or "With XM controls" radio and install a separate XM receiver box.
For example this would be the in dash deck: http://www.crutchfield.com/App/Product/Item/Main.aspx?o=p&showAll=N&g=300&i=158XRCA350&tp=5684
And this is the XM receiver: http://www.xm-radio-satellite.com/index.asp?PageAction=VIEWPROD&ProdID=3951
I would suggest finding an in dash receiver that also does HD radio as well as XM.
Egads, I imagine that the electrical system in your car is not properly shielded.
You can attempt to locate the unshielded wires and cover them, shield the XM reciever (the interference is most likely within the reviever, not the antenna), or try repositioning the reciever in your car- unless it's in-dash. If it's in-dash, it may be that some of your audio cables aren't properly shielded also.