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You'll need a wiring diagram for that circuit -- something is drawing too much current. Sorry, I don't yet have one (yet) and mine would be for Gen2 anyway.
Could be a short where a live wire touches metal on the car body (short to ground) or a live wire touches a bare ground wire. This is possible anywhere along a wrapped harness because wires can chafe off their insulation, usually at sharp bends in the harness or areas where thin-ish body elements impinge on the harness.
Could be a jammed blower motor because some motors draw a lot of current if they aren't rotating, or the fan motor might have an internal short.
Since the heater/AC fan isn't working, I think you can rule out the electrical clutch on the A/C compressor.
You may have to remove the dash/instrument panel to get to the wiring...
Unfortunately, because of the time required to trace down electrical problems, if you leave the labor to a shop you can anticipate a big bill.
01 Avalon XL
03 Avalon XL