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2003 CTS Manual Trans., '93 STS
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First, I hope you don't simply replace your old radio, but rather have read the instructions over at Reeds site:

http://www.cadillacfaq.com/faq/answers/navconvert/index.html

If you don't do the VSS wire, it won't work. You may need to have the VIN cleared at the dealer with a Tech 2, if it shows a screen that says 'Theftlock Activated'. You should have also installed a GPS antenna, then plug in the map disk. THEN it should work fine.
 
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