OBD codes
 

Hello all,
I have always owned Caddys with the exception of my last car(Lincoln). I am looking at a 1998 deville. I remember how to get it to go into the diagnostic mode(pressing warmer and off at the same time). It has maybe 7 codes in the history. I foget how to clear the codes using the heater control buttons. Can anyone refresh my memory?
Thanks in advance.
Ray