How do you check the codes on a 2001 Deville? :hmm:

Unless things have changed from '97-'01, simutaneously press and hold the off and warmer buttons. Release them when the DIC light up like a christmas tree. The codes will then be displayed as current or history.

I have the electronic climate control. Is the warmer button the one with the arrow that says temprature?

can anyone answer his question. I need to know too... there is no "warmer button" in my 01 deville. :bouncy:

Ok, then yours may be configured like my '02 SLS. Simultaneously press and hold the INFO UP & OFF buttons (if so configured).