Dimming Of The Instrument Cluster
WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
The brightness of the LCD display and all indicator and warning lights is adapted to suit ambient lighting conditions. This function is implemented by a photo-transistor in the instrument cluster.
The brightness signal is calculated in the instrument cluster on the basis of the following values:
- Signal from the photo-transistor (ambient luminosity)
- Dimmer signal (on the control panel for the lights)
The brightness signal calculated in this way is made available to the other control units via the K-CAN.