I am sorry that you have not been helped yet. I just came online and saw your question.
Ok, fuse #1 goes to the multi-function switch on the steering column, the brake switch at the brake pedal, cruise control and the turn signal switch.
Start by disconnecting the brake switch above the brake pedal, insert a new fuse and see if it blows. If it doesnt, then either the switch has an internal short or a short in the wiring to it. Replace switch and if fuse blows again, you will have to physically trace the wiring under the dash from the fuse box to the brake switch.
If the fuse blows with the brake switch disconnected, then you will need to remove the steering column covers and disconnect the multifunction switch, turn signal switch and cruise control switch one at a time and insert new fuse until it doesnt blow when one is disconnected and then replace that switch and if still blows, physically trace the wiring
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