Cadillac Repair: 1991 cadillac sedan deville, cadillac sedan deville, starter relay

Question
I am could it be a starter relay or theft deterrent contolller. if so where are they located and what do they look like . How do you get the codes from the vehicle. thankyou. Is there any suggestions to try. Please help.

Answer
To get the codes from the computers:

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

2. Simultaneously push and hold the OFF and WARMER (^) buttons on your climate control panel and the codes will display on the climate display panel OR on the FUEL DATA display.

3. Write them down EXACTLY as if you were video taping the display and let me know what they are.

4. Turn ignition switch OFF.