Instrument Panel Lighting "day mode" or "night mode" is controlled/commanded by the BCM (body control module), with ambient light level information being fed to the system by the ambient light sensor, located typically at the top of the dash, near the base of the windshield, as Tx Tom indicated in his post above. Normally there is a significant "delay" time built into the (BCM) software that controls (times) the changeover from one lighting mode to another, to prevent excessive or unnecessary or nuisance lighting mode cycling. Not sure what is happening on the Envision in this particular situation, but it sounds like the lighting mode delay timing is not optimal for those particular conditions.
Dougloftus - when engaged in normal "nighttime" driving (when not negotiating LA-area canyon roads), are you finding that the LCD displays are bright enough, or do they need to be brighter? Is the problem you report occurring at any time of the day, or is it happening only at dusk and dawn?
By the way... are you speaking of only the instrument cluster/D.I.C. display for the issue you report, or are you also including the center stack-mounted Infotainment panel (touchscreen) in your observation?
If this reported issue is confirmed by Buick as being a genuine problem experienced by many, then I would expect Buick to issue a software change/update to address the problem.
Last edited by rbreeze; 07-28-2016 at 09:39 AM.