Thread: Radio Codes
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Old 05-20-2005, 01:03 PM   #9
Tool Pants
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Join Date: May 2002
Location: San Jose
Posts: 1,889
If your 2004 has the optional amp then the rear speakers are powered by the amp, not the radio head. The amp in 2003/4 is 6 channels, so you use 2 for the rear speaker kit.
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