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TURN KEY ON THEN PRESS AND HOLD OFF AND WARM (ON YOUR CLIMATE CONTROL) FOR THREE SECONDS OR TILL YOU SEE THE COMPUTER GOING INTO CODES MODE FROM THERE THE CODE HISTORY WILL SHOW THEN YOU CAN SCROLL THRU ALL THE COMPUTERS (ECM ,BCM, MAP AND SO ON) WITH OFF TO SELECT USE LOW AND HIGH ON YOUR FAN CONTROL. IT TOOK ME A FEW TIMES TO GET WHERE I WANTED

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Q: How do you read the codes displayed on a 1991 Cadillac Seville?
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