Cadillac Repair: 89 Cadillac DeVille/service engine light, prom chip, cadillac deville

Question
QUESTION: Heater panel shows a "C" I have held the off and heat buttons and get no response still shows the "C" any suggestions?  Thank Joel

ANSWER: would that "C" possibly be a -c

Is there also a -c on the fuel data display ?.

---------- FOLLOW-UP ----------

QUESTION: Yes you are right the c is small and is also on the fuel data display, again I thank you  Joel

Answer
You need to replace the BODY CONTROL MODULE (BCM) and swap the PROM CHIP from your old BCM to the new BCM. This is a procedure that is very easy to do.

If you are mechanicaly inclined or know of someone who is, You will need simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.