weird connector with short cable originating from fuse box!??

looks pretty oem, but could be well done aftermarket. are you the original owner?

any shots inside the fuse box?

 

Good call bisco. Three conductor? Odd. While it does look OEM, the wire leading to it looks a bit DIY.

 

You should check the wipers, could be the connector from wiper motor... see the green arrow in this picture...
OEM connector has 5 fires, but in your case can be another motor...

 

Here is a picture from my engine...

 

Is it practical for you to take the car back to the shop that worked on your car three weeks ago? Show them the dangling connector and ask them to put it back the way it's supposed to be, probably under the windshield wiper cowling, as shown in the previous two pictures above.

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@FERENC KELLER

this^
turn your wipers on, either they move or they don't /
if they move, problem solved; if not, the time has come to dig deeper....

 

In this case, you can find here all the connectors for any car.
Choose model and year and click on any connector seems similar to yours...
2014 Toyota Prius Wiring, Cables & Connectors at CARiD.com

Also you can mke closer picture to read code on the connector...

 

It might not go to anything. At least anything for your model. It is common to find plugs like that.
But it be a good idea to take it back and have them check it out.
If you run all your accessories and no codes or problems with the car, it could just be a connector
for a feature you don't have.

 

When I look at that second picture I see an OE "blanking" plug (there are no wires coming out of it) . I think that the connector is for something that your car isn't equipped with, and Toyota put a plug on it to keep water and corrosion out.

Posted via the PriusChat mobile app.

 

Ferenc,
Can you make more detailed pictures?
I am curios where your wipers cable it is...
Also, in case you have a code written on that connector, make a zoom picture.
Useful to recognize is the color of wires too...

 

It looks like a three-pin connector. I can see a blue and a white-with-black wire at the connector. I cannot make out a third wire there in the photo, but there is some red visible through the untaped part of the harness further up.

 

In my manual most of the ground wires are white with black and Red are continuos +12V (BAT).
Here is schematics from wipers... you can observe the 3 ones...
I am thinking that someone took a connector with wires from another car, or could be from headlights washer, etc.
The second picture is from rear wipers, but they use 2 same wire colors.

Later edit:
Ferenc, I am not sure, but this could be a serial that can help...
Can you make a picture closer?

 

Here's what mine connects to. Not sure where the other end leads to.

 

I bet you've got a US model with the steering on the left, correct? That's what I've got, and I have that two-pin connector there, which in our model is for the brake fluid level sensor.

But the OP has a UK model with the steering on the right, and I'm sure the brake reservoir is over on the other side too, and the OP has a three-pin connector at this end. I liked the wiper-motor guess at first, except that the OP's wipers are working, and that's reportedly a five-pin connector anyway.

This one does seem to be sealed off, as a known-unused option. It would still be interesting to know what option. The wiring diagram will explain all ... the question is just who will get around to looking there first.

 

You're right. I don't see his brake fluid reservoir. Good eye.

 

You can notice this also by wipers position...
I found here another view of same engine compartment, and if you look closely (red arrow) you can see a similar cable going under the plastic cover, so I think the cable must be from wipers..

 

That would be a very satisfying guess, if the connector had five pins ... or if the OP's wipers didn't work.

 

Yeah, the fact that everything works suggests it is for some option the OP doesn't have.
Although I don't like that hypothesis given the cable flopping in plain view, its the only one that fits all the facts.