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Don't get confused. When I said "heater controls" I meant the little bulb in the panel that lights up the wording at night. Same with the radio. Not the radio itself, just the little light bulb that plugs into the top that lights the dial up at night.
If you have this many problems, I would pick one, and concentrate on that. You may run into something that fixes many of the problems, or you might have multiple problems that will have to be fixed one at a time.
The dimmable dash & cluster backlighting lamps are on a separate circuit all by themselves - the LB/R wire mentioned above.
That circuit is fused by a 5A fuse in the fuse panel.
The problem of that 5A fuse blowing and the dash & cluster lamps not working is necessarily contained in that specific wire, don't complicate the issue by getting other things involved.
The HVAC panel has its own light bulb serviced by that fuse.
Ok, I now have the instrument cluster lights fixed. Like someone posted earlier, stereo shops tend to ground the Light blue red striped wire. Sure enough, I pull the radio and it has been grounded.
I cut the wire, installed a new fuse and the lights work!
This is the first day I have had to play around. I haven't worked on it since the last time I posted in here. (Had to rebuild a Toyota engine for my nephew and get him back on the road.)
I would do as others have said and unplug the instrument cluster plug and see if it still blows the fuse. Don't put a bigger fuse than the circuit is rated for your likely to burn foil patterns and damage something else.