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Had our 2016 XLE Sienna for about 2 years now and just couldnt take anymore of the terrible sound from those paper speakers. Along with some pretty nice speakers I also hooked up the Alpine KTP-445u, I have a problem with the lights on the OEM head unit, when they go dim at night or really dark areas (tunnel, under bridges) it REALLY goes DIM, like dark dim.
Just curious if you had that problem when hooking up the Alpine power block? I know it has something to do with the Dimmer or Illumination wire, I just need to pull the dash again and get it hooked up. Do you recall anything like that happening to you? the dimming action?
A little more detail on my upgrades....

JBL GTO939 - front doors, no pics
JBL GX302 - dash, (with bass blocker, rattled the dash) no pics
Infinity REF-6522EX Shallow-Mount - rear (used OEM speaker frame)
80 mil sound deadening, front doors, rear qtr panels, and lift gate
Subwoofer still in the works


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