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No. In 2004 GM introduced a new type of computer comunications called GM LAN. The 2004 cts won't be able to comunicate properly with the 2003 radio, although some functions will work.

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โˆ™ 2008-03-01 21:48:44
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Q: Will a 2003 Cadillac CTS radio work in a 2004 Cadillac CTS?
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