Display and Push-Button Lighting

Pin numbers refer to M1995-.

The rheostat supplies PWM (pulse width modulated) voltage to pin 31 on the ACC control module.

This voltage controls the strength of the display lighting, the push-button background lighting and the LEDs.

The fourth light strip from the top in the row with the buttons for adjusting the air distributor is a photo transistor. Data from this is used to adjust the lighting of the ACC control module display as well as the LEDs.

In darkness, the value is determined by the rheostat and in daylight by the brightness of the light in the cabin so that the panel can always be easily read.