It doesn't make any sense if the same sensor (in rearview mirror) causes the rearview mirror to dim OK.
Originally Posted by 862743
Brought the car back to the dealer 2 more times. They admitted that the side mirrors do not dim very well at night and blamed it on the tinted tailgate glass and the height of the X3 (as compared to a 335 with no tinted glass when I said the side mirrors work fine on my 335). They said that the tinted glass and height prevent or limit the light sensor on the (inside) rear mirror to detect the lights from behind. And since the dimming on the side mirrors works on much light detected by the rear mirror at night (the sensor activates the computer to send electrical current to the side mirror), the less or no light detected, the less or no dimming. I tried to convince BMW that they should modify their program coding to increase the current sent to the side mirrors, but no luck so far.
2013 x35i (Space Gray, MSport, CW/CWII, DHP, Premium, Premium Sound, Technology, BMW-Apps)
Retired:'09 C300 4Matic, '09 GTI, '06 750i, '05 C55, '04 R32, '03 M5, '02 GTI, 01 M5, '00 M-Coupe, '00 540i/6, '99 M3 Coupe, '98 M3 Coupe, '96 328i, ..., '86 4000CS Quattro, ... too many to list