What is this for?

I have a 2.7 sr seen this was connected to nothing it’s right behind the driver light of someone can help would be awesome thanks

 

I have the same thing on my TRDOR.

 

Sorry to not provide an exact answer, but there are numerous options your wiring harness includes but were not built into your truck. Sometimes they don’t require software and you can get lucky and just add them. Otherwise, don’t worry about a loose plug like this unless you took everything apart and then found one hanging afterwards.

 

That's where you plug in the OEM engine bay cleaner. Give it a shot!

 

The Toyota electrical service manual will provide exactly what is that harness for. Perhaps if you talk to a Toyota master mechanic will confirm what it is.

 

It’s the connector for the oscillation overthtuster; the newer models now use a flux capacitor.

...Sorry, I had to

 

Probably for the engine block heater option.

 

Isn't that the connection for the 2016+ blinker fluid regulation system (BFRS)?

 

It's to connect the transmission shifting logic, otherwise the transmission holds gears to long, lurches and doesn't perform will in cruise control up hills.

 

Optional front brake light

 

Start the truck and stick your finger in it. If you get shocked, it’s got power!

 

Fog lights maybe? If it is there should be one on the other side too.
If you want to buy so fog lights and a switch they will work.

 

No, just one connector for fogs.
You need a switch (or stalk) a relay and a harness up front. Nitori did a great write up on this.

 

Mine has factory fogs, but I still have that loose connector.