Photocell back of E38. What is it? Auto lights on. How.....

[morningside]

I just noticed (a year later ) that on the back of the mirror near the windscreen there is a photocell. Now I presume that this is for the auto light on feature? If so how on earth do I activate it as I cannot find it in the manual?

E38 7 Series. "N" reg

[rassi]

If you have automatic headlights, you just need to turn the headlight switch to the left from its off position and you will have this feature activated.

[Umar B]

morningside said:

I just noticed (a year later ) that on the back of the mirror near the windscreen there is a photocell. Now I presume that this is for the auto light on feature? If so how on earth do I activate it as I cannot find it in the manual?

E38 7 Series. "N" reg

Wow, didn't know ther was an option for that, can you supply any pics? just being nosey

[morningside]

Thanks But the control will not go to the left, so I presume that I do not have this feature even though the sensor is there.

[blackspider]

The photo cell is to dim/brighten the instrument cluster lighting.
When dark the orange is softer and in day light it is brighter and to also change the electrochromatis mirrors(if you have them).
There is a second cell on the dash to measure the cabin light aswell
I dont think auto lights came out til around E46-2000 ish may be a bit before.

Edited by blackspider on Friday 15th December 19:53

[morningside]

Ah. Thank you! Thats makes sense. Added (cos you did). I do have the electophotoautocromic mirror things.

Edited by morningside on Friday 15th December 19:53

[fixedwheelnut]

It is for sensing night time and affects the sensitivity of the electrochromatic mirrors.
Cover it up at the front and shine a torch at the smaller sensor on the rear view mirror facing you and the mirror will dim.
It stops you being dazzled at night by following cars.