Cadillac Repair: 1993 cadallic allante emissions, climate control, allante

Question
I replaced the engine control computer and tried the TPS/Idle Learn Procedure. Turned the ignition on but do not know how to enter the diagnostics. How is this done. any help would be appreciated.

Answer
1. Turn the ignition key to the ON position.

2. Do NOT start the engine.

3. Simultaneously Press and hold inward the OFF and WARMER (^) buttons on your climate control panel for 3 seconds and release them.

4. Each code that appears, If any do, Will be followed by the letter C or H.

5. The display will stop at ECM?

6. Write down the code #'s and the C or H and let me know what you see on the fuel data display.

7. Turn igntion key OFF.