528Wagon A/C Problems

My AC has stopped.....when I push the blue snowflake AC button, it does not even light up!!!
One would think "fuse", but they are all ok....
For that matter, the orange "re-circulate" button does not work either!!

Any ideas?

Bman

bmw used several different IHK systems in E34's. if you've check ALL the fuses in the front E-box, sadly and while that little switch block might be bad, the most likely cause is a failed control unit [located between the heater box and firewall] you need to pull out the glovebox, consoled side cover[carpeted] and the air duct [3 phillips screws]...it simply sides out and unplugs.