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FWIW, The Solar Sensor in the E9X (on which the X1 is based)...
Sunlight Adaptation (solar sensor)
How the solar sensor affects the IHKA regulation on the driver's side and on the front passenger side is not programmed separately. The following functions are modified when automatic mode is activated (depending on the intensity of sunlight):
• Blower output is increased or reduced
• Desired temperature value is increased or reduced
I think, at best it is rudimentary when it comes to compensation due to solar gain or loss...
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