MY 03 - 06 Saab Audio / Infotainment control panel - mystery light?

[ReAxs7]

Over at UKSaabs a member posted a query regarding a mystery light on the audio control panel. Since I own a similar model to his I thought I'd assist by looking up my car's audio handbook ... no joy there so on to the WIS & EPC ... again to no avail. His thread drew no answers either. Now I'm as puzzled as he. I've included a photo to illustrate its location.

If you go to No.8 - The Selection knob to the right of the panel there's a small circle at the 11 o' clock position in relation to the knob. This is the mystery light. Looking into the lens on mine gives the impression that it would show red if lit. It appears in the handbook illustrations for all three variants of the system, i.e. Saab Audio, Saab Infotainment & Saab Infotainment Plus. Can anyone here at STT solve the conundrum?


 

[chris aka zaphod]

It's a light sensor - controls the brightness of displays.

[ReAxs7]

Ah, mystery solved.
One of the replies to the UKS thread did mention a light sensor but it was phrased in a question so I took it the person who replied was asking if this was a possibility.
Thanks for providing a definitive answer Chris.

[aerojon]

all the icm panels have them..aswell as there is a  light sensor in the dome where the alarm light is..

[ReAxs7]

all the icm panels have them..aswell as there is a  light sensor in the dome where the alarm light is..

Thanks aerojon.

I was aware of the dome one. The hanbook calls it the Sun sensor and it measures: intensity, height and angle.
But I was totally in the dark, so to speak , about the ICM panel ones.