If you only get code 12, there are no faults stored in the system. The first and last code you'll get is "12", which indicates that the computer is in diagnostic mode. The format is "first digit, short pause, second digit, long pause", and the fact that each code is repeated three times makes it easy to figure out. All GM codes are 2 digit, and each code will repeat three times before moving on to the next stored code. WITHOUT STARTING THE ENGINE, turn the key to the 'run' position and watch the "check engine" light. Assuming you have located the ALDL (Assembly Line Data Link) under the left side of the dash, with the engine off, connect the A and B terminals (or the #5 and #6 terminals in the case of an OBD-I vehicle with the 16 pin OBD-II style connector) with your trusty paper clip.
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