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All three circuits are on different fuses. Do you have power on the fuses for dash lights and the radio ? The radio should be using two different fuses, one for regular power and one for memory.
You should start with you fuse block itself. For that many different things to be not working the one thing they have in common is the fuse box. if the fuses are good you may have a faulty fuse box itself. Use a voltmeter and test the slots to the fuses for each electrical item. If you dont have voltage going to your fuses then the box needs replacing. If you do then either fuses need replacing or damaged or broken wiring.
Be sure to check fuses. You may have a blown fuse. If have the owner's manual, check for fuse block diagram and check for one listed as radio. If fuse is at fault, may have loose wire that caused it to blow.
when you pull the fuse panel cover it has a diagram that tells you which one. Also you can just look at the fuses, if its blown you just replace it. I would also check your ground going to the radio, they usually don't blow unless you have added a amp or something not designed for the vehicle, you probably need to increase the ground size cable.
In my case the solution was a fuse on the passenger side inside fuse box. It is not listed as a fuse for the radio but it is none the less. If your cigarette lighter isn't working either its the fuse. On my 2004 it was fuse # 9 a 15A fuse.
I had a friend who owns a small dealership make a call and he received a wiring schematic that showed that the radio has an external audio amp located under the dash below the steering wheel. The amp was shorted.
If you know the fan works with direct battery voltage and you have no voltage at the fuse block then you have a problem at the fuse block. You need to remove it and check for corrosion or a short. This could also have something to do with your radio and buzzer. Pull the fuse for the radio and remove the buzzer and then check to see if your test lamp lights across the 25 amp fuse opening for the blower.
Also with fuse in place check for voltage at the yellow/brown wire going into the blower motor switch. Just cover all your bases before going at removing the fuse block.
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