I have to say, your website is one of the most informative I've seen!!! It's fantastic.
I did discover yesterday that by pressing the rest button, I can read the operational check of the A/C System. I do have what I think is an error...Under test step No. 9, I get an E. I assume that it means that something in the Pushbutton is bad and that nothing else is affected...however, I have not read out the DTC's yet. My A/C Pushbutton is newer than the one you have shown...I'm still trying to figure out how to get to the DTC codes.
Any information on this would be much appreciated.