All dash gauge and navigation lights go dark and unreadable when going from bright daylight conditions to shady conditions such as driving under a dark grey cloud shelf , in heavy rain, or even driving into tree shade. When you are in heavy downpour at 65, 70, or 75 mph it can be very panicky to not only drive but see your speed. Only very, very faint gauge info and nav info are displayed, so you cannot tell speed or if under guidance, where your turns or lane guidance info are. 2 Buick dealers have "flashed the...
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chip" and occurances have lessened, but still there. One instance only "fixed" by restarting the car after taking a highway exit, the other I could restore by using the dash light brightness option after holding the switch for 15 seconds. The vehicle was in motion each time at varying speeds both in city and on highway. We shined a flashlight on the sensor located center front of dash with no return to normal intensity. I think problem lies in both the programming and the light sensor circuit itself. Service personnel cannot duplicate (of course). This 2nd report to you, the chip was flashed after that report. Thanks.