My "rest" button works as a "max A/C" as well, maybe it had updated firmware in the past though. Yes, I was just complaining to someone that the E-53 didn't have a sun sensor, sure could use one. The whole IHKA works really well except for not having the sun sensor to compensate.

__________________
1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)