service 4wd light, where is t-case fuse?

[ira]

i got service 4wd light on.
when i start the truck, all the lights on 4wd switched come on for few seconds and get turned of.
light on 4wd-hi used be on all the time.
ive never done no off-roading,only switched 4wd settings few times just to see what happens in past 5 years
i only drive clouded city streets in japan, so i dont really need to put it in 4wd-low or even lock the diff.
but its very annoying knowing that this serious off-road truck been not able to even put the transfer in low or lock!!!
shop told me it could be just the switch.
so i changed the switch and didint fix any thing.
could anyone tell me where exactly is t-case fuse located?
i got service 4wd light on.
ill to try reseting the computer by pulling the t-case fuse out and also disconnect batteries for 10min.
if anyone has any advice, ill be greatly appriciated.
thanks