Fusable Links - interior fuse box on 1990 Nissan Pathfinder

Can anyone tell me what each of the four fusable links in the top
of the interior fuse box (below & left of steering column) do? There is no description on the chart like there are for the normal 10-40v fuses.

Many thanks!

Asked by for the 1990 Nissan Pathfinder
If you had access to an accurate wiring diagram, it would tell you. Fusible links are there to provide circut protection for large load centers, such as the lighting system, the heater blower motor and A/C system etc. ( I am referring to interior controlled systems )