Unfortunately no..the dash brightness controls only the instrument back lights..not the nav screen....
There should be a little delay time between switching...if it switches back and forth too quickly, there maybe an issue with the sensor on the center dash near the windshield. looks like a bubble...Make sure it is clean of any dust or film..
There should be a little delay time between switching...if it switches back and forth too quickly, there maybe an issue with the sensor on the center dash near the windshield. looks like a bubble...Make sure it is clean of any dust or film..