1995 honda dashlamp replacement& defrost circuit

I priorly sent a post out on my dash backlight replacement - it does not seem that simple does anyone know a step by step way to get to the lamp? Also my defrost on my rear windows does not work, yet the fuse checks out ok? I ran across something in searching the Internet about some computer module that could be the cause of this. Does anyone know of a simple way to find out of this module is causing my defrost issue? I am an Electriciam and am pretty handy over all but am a bit of a virgin to doing any automotive work so keep it simple but don't think that I can't duplicate how to do something