Mazda Repair Questions? Ask Mechanics for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer working afternoon till just after midnight.
Since the dimmer is adjusted correct and this recently occurred and its now stuck this way, this means its the LCD screen for the navigation that is to blame. It is not adjusting the brightness intensity correct per the input it is receiving. You will have to replace the navigation unit to address this.
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Hello again Chris here,