[austin.tillison]

bump. my dash lights seem to be doing the same thing. did you ever find out what was causing the dimming? I'm starting to think my battery might be on its way out

[djh2]

Originally Posted by austin.tillison

bump. my dash lights seem to be doing the same thing. did you ever find out what was causing the dimming? I'm starting to think my battery might be on its way out

It might be better to start a fresh thread next time, according to the user page it looks like OP sold his e90 several years ago.

Anyway the instrument cluster is designed to dim according to ambient light conditions. This is most noticeable when you exit a tunnel and the LCD displays can be seen adjusting to the new conditions.

See excerpt from the newTIS site (and browse around there, lots of great technical info) https://www.newtis.info/tisv2/a/en/e...uments/26YmOnB

Brightness control

The instrument cluster is illuminated when the lights are switched ON.
A phototransistor is installed in the instrument cluster to calculate the necessary brightness (display, indicator and warning lights, scales, needles).
The brightness value calculated in the instrument cluster is output on the K-CAN (e.g. for the Central Information Display).
Dimming can be set individually via a menu in the instrument cluster.
When the vehicle lighting is switched on, these individual settings and the phototransistor are used to control the dimming.
When the vehicle lighting is switched off, the dimming is only controlled by the phototransistor (display brightness according to ambient light).

If this is what you see happening then continue to enjoy the feature. Otherwise you’ll want to provide more information so that someone can help out your specific problem.