Cadillac Repair: 92 deville self-diag, self diagnosis, climate control

Question
How do you enable the self-diagnosis option on the 92 deville

Answer
1. Ignition ON, Engine OFF.

2. Push and hold the OFF and WARMER buttons simultaneuosly on the climate control panel for 2 seconds and release.

3. Write down ALL the letter/numbers that appear on the screen until it stops displaying these combinations.

4. let me know what codes you get.


5. Turn OFF ignition.