G3X Touch Lighting Bus treshold voltage

I read that most of the Garmin avionics backlight can be setup with a lighting bus treshold voltage. When the input voltage at the lighting bus is below a certain level i.e. 1.5V the LRU will automatically switch to AutoBrightness using the integrated photocell.

Is this valid for the GDU460 as well? I found this 'Off Threshold' for the GDU37X only..

I would like to control the avionics backlight via the GAD27+potentiometer.. I just couldn't find this option for the GDU46X in the manual.

I must have been blind, found it on page 35-128