Aux headphone port cause blown fuse??

Make the car READY.

Open the hood and with a flashlight take the black cap off the Inverter Coolant reservoir. Its the white container just to the left of the big silver inverter and filled with red toyota sllc coolant. Look inside that reservoir for the attitude of the coolant. It should look like its boiling reflecting good circulation=good inverter pump. If its just sitting there or barely jiggling or flowing the Inverter pump is bad. They sometimes blow the fuse when there getting ready to commit suicide.

Unless it got the free pump under the factory tsb a few years ago its probably the original pump and wow did it last a long time.

I would replace in anyway its a very important pump and a high failure item. The pump cools both the inverter and the trans.

 

That jack is NOT a headphone (output) jack, it is an Aux. INPUT jack.
Not likely it is a factor.......but unplug it for a while if you need proof.

 

Unless it is battery operated, your Bluetooth adapter should have two connections, not one. 1) Audio output which connects to the AUX 3.5mm jack, and 2) DC power supply - usually connects to 12 VDC cigarette lighter adapter.

The Audio output connected to the 3.5mm AUX jack will not blow a fuse. However overloading 12 VDC potentially could.

Have you tried connecting the Bluetooth adapter to another audio system? If the Bluetooth adapter is loading down the power supply, it will not work for any other audio systems as well.

 

No the pump can not be running and not blow a fuse it may be open. Your hybrid guru should have looked in the reservoir. Its all a moot point if the car is on in ready and no fluid movement the pump must be replaced. Its probably the original pump. Very very common.
You aux input device didn't do it.

Go online and look up Olathe parts that's a toyota dealer i use buy it online. I also looked on ebay and theirs many for $50 brand new toyota part. Do not buy a parts store pos pump.

Do you own any tools? Its easy to replace but if i was you I would replace the fluid too its the original fluid and its shot.Its easy.
Hundreds of post on this site how to do it. Use search forums button up top and search:

inverter pump

Its pretty easy you pull the front bumper down and take out the headlight assy and the pump is right there.Based on the age of the car I would rebulb the entire car with oem lamps especially since the bumper will be down. Rear re-bulbing is very easy just an unplug. With the bumper down its really easy to replace the headlight bulbs. Without the bumper down its really really hard. Without that pump working you are getting the inverter and the transmission really really hot.
Inverter replacement is big $$$$$$ so tic toc.

I have replaced the inverter fluid twice and the trans fluid 3 times myself and I'm in my 60's.
Whenever your working on any part of the car it pays to address whatever else you can get your hands on in that area if the car is dismantled. The headlights are a real pain unless the bumper is pulled down which is easy.

Here's pic of the pump after headlight has been removed:

Here's a video of Luscious garage in SF replacing it another way by lifting the inverter out of the way:

VIDEO - Gen 2 Prius inverter water pump P0A93 - Luscious Garage | Hybrid Specialists

Here's Carolyn owner of Luscious pulling the bumper down in 5 mins to gain access to the headlights:

 

Btw, Prius G2 does not have a headphone out jack in its stock radio. Not many do it only has a aux input in the center console for external audio input to the radio like your phone etc.