Sure thing...  you go to the alt.autos.gm.cadillac group, and post there...

Under your dash, there should be a little black connector.  By making a
jumper wire, and shorting two of the terminals together, then turning the
ignition to 'ON', the Check Engine light will blink out the various codes.
I believe it blinks each two-digit code three times (it does on my '90
Suburban, at least).  See these sites for specifics:

http://www.obd-codes.com/faq/read-gm-2-digit-obd-codes-free.php
http://www.gnttype.org/maint/malf.html