I have a 2005 chevy silverado with the z110 with the 120 upgrade. I have tried hooking the wire up directly in the harness and to the dash lights. Still with the lights in the auto position (which allows for the daytime lights and then switches to the regular lights at night) the map screen will not switch to the dark map when the lights come on nor will any of the screens dim. If I manually switch the lights on then the map will inverse to the black screen but the others still will not dim. Is there a way to hook up the unit or a setting that I don't know of that will allow the system to work properly with the lights in the auto position? Thanks in advance

check the wire with a voltmeter to see what you're feeding the AVIC.

check the wire with a voltmeter to see what you're feeding the AVIC.

What is the AVIC looking for a constant +12 volts, I am having the same issue on my 2008 corvette and have some choiecs on where to hook up the gray wire just not sure what the unit is looking for to allow it go in night mode when the lights come on?

the gm light wire at radio is not 12 v its pwm. hook light wire to ash tray light or a parking lite wire jim