Cadillac Repair: service ccr on 1991 seville, computer command, word history

Question
What does service ccr on a 1991 cadilliac means? And how do I look for the codes?

Answer
CCR = Computer Command Ride which is part of your electronic suspension system.

To check for cODES:

1. Turn ignition switch to the ON position. Do NOT start the engine.

2. Simultaneously push and hold the OFF and WARMER buttons on your climate control panel for 3 seconds and release them.

3. On your fuel data display you will see codes in the form of LETTERS & NUMBERS along with the word HISTORY or CURRENT with EACH code. The display will stop at ECM?

4. Tell me EXACTLY what appears on the display as far as codes and if they are history or current.

5. Turn ignition switch OFF.