this is in reference to the AC question...

The A11 module from 09-1999 to 09-2000 has 5 connectors and the newer A11 modules have 4 connectors. Extra connector X18153 (6-pin) from the older module has only one pin engaged, and that is the pin that seems to be the INDEPENDENT PARK HEATING CHECK VALVE. That pin has been moved to another connector (X610) on the newer modules, and the whole connector X18153 was eliminated - but the point is, there are same functions between the both, older and newer A11 modules...

I can not view SVG files at work, so I can't trace that pin on the schematics until I get home, to see if that signal goes to same locations on both, older and newer cars...