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GO HERE FOR MORE INFO!!! http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/84273-finally-been-done-cadillac-obd-2-a.html

with this mod you can see your cars MPH and Coolant temp displayed on the DIC 1) Press the OFF and PASS WARMER (referred to from here as WARMER) buttons simultaneously to enter diagnostic mode. 2) Let the system read any codes it has stored. You will ultimately be presented with "PCM?"...