on my newly installed pioneer in my 2011 Z in order to get it to dim when i turned on the lights, i had to first, turn on the lights, bring up the brightness adjustment and dim it down with the lights on, its saved that setting.
now when the lights are off it stays at full brightness and when the lights go on, it dims to the lower setting i selected. I had to hold the MODE button for 3 seconds to bring up that "picture" adjustment menu. perhaps you have it hooked up right but need to adjust the brightness?
did you already do this step?
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11 SR 370Z Sport 6MT - Sold
03 Escalade AWD - Sold
13 Silverado LTZ Z71 Crew Cab
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