Hi Raj,
My car has option: S431A INTERIOR REAR-VIEW MIRROR WITH AUTO DIP which is just for the rear view mirror dimming.
However I think for the exterior auto dimming mirror to work the car vehicle order (VO) needs to be coded to add option: S430A INTERIOR/OUTSIDE MIRROR WITH AUTO DIP - I am unsure if option S431A should be removed if S430A is added, but I am sure a coding expert will confirm?
Then you just need to ensure in the CAS module that SPIEGEL_ELEKTROCHROM is set (i.e. coded) to "aktiv".
I am a bit of a coding novice but this seems like a coding issue.
Cheers,
Eddie
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2008 E92 325i Black Sapphire M-Sport Coupe
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