check engine light and codes 04 lemans convertible

Can anyone tell me which buttons to hold to get the codes when the check engine light just pops on? 04 convertible,lemans.
also a place to look for what the codes mean.
Also was there a twx on the drivers seats breaking on the C5?
Thanks for the help in advance, always good advice here
Ken 04 lemans convertible 95 arctic white coupe
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http://c5forum.com/ayc/dtcdic.php
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Thanks for the codes, anything on chevy fixing a broken seat back?
Ken

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