I have big issue on my Nikon D3200: If I use an IR remote control, the AF-Assist Light always flashes, after taking a photo, although I explicitly disabled it in the menu!
How can I disable it completely?
According to page 33 of the D3200 Reference Manual, the light you see is functioning as the self-timer lamp, not as the AF-assist illuminator. The manual includes no instructions as to how this feature might be disabled.
One possible workaround might be to use an MC-DC2 Remote Release Cord (1 Meter) wired cable release instead of the wireless remote.