On the 03 Accord, XM radio is a separate unit and it costs a bundle to add it. The problem is even if you have the tuner built into the 04 radio unit, you don't have the right hardness or antenna to get it to work. At the minimum, you will need the audio attachment, the XM antenna and may be even the audio sub-hardness. Check the installation manual but the XM function may or may not working, even if the CD/radio does.
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