Did you check the owner's manual?
There are several locations.
One is in the rear.
Also, Trim level, AWD/FWD and Hybrid or gas makes a difference.

 

Mine is AWD XLE.

 

In the Hybrid, there is one in the back, on the right. It is hidden when the 3rd row seat is down or up, I don't remember.
jf

 

What year? is it Hybrid?

 

It's directly under the hood lock release lever and fuel filler door opener switch. You literally have to lay the back of your head down on the floor to be able to see it. There's also a plastic cover you need to remove. Here's a pic:

 

I can find my fuse boxws but I cannot find a diagram that indicates which fuse does what

 

Not on the fuse box cover? If it's missing try googling your model/make/year +
"fuse box diagram"

 

The non-hybrid models have three fuse panels - two under the hood (above each fender) and the third near the drivers left knee under the dash. The hybrid models have a fourth panel in the passenger rear quarter near the battery. Here is the layout for the "under dash" panel. Fuses may be present or absent depending upon the trim level.

 

Hello Gents, I have got blown fuse in my car Highlander XLE Hybrid 2021, do anyone knows, which sistem protects fuse ECU-IJ1 NO.3 (7.5A), in which reason or case my happened?Replaced fuse and blown again, also air conditioner not cooling 😞

Do someone has each fuse protection information list?which fuse protecting for what system?

 

You mislabeled the fuse in your original post. It's IG1, not IJ1.

Anyway, here's the info you seek. It's from the NA factory Toyota electrical manual. You're going to have fun finding that short.

 

Sorry for confusion, thanks a lot for information, too many protection systems under onə fuse, unbelievable.

Also,above information for Highlander limited 3.5L FWD, but I need Highlander XLE Hybrid 2.5L AWD 2021, is't will be identical?

 

The list contains 2GR-FKS (3.5L V6) / T24A-FTS (2.4L 4-cyl turbo) / A25A-FXS (Hybrid). Circuits unique to the hybrid will only show the A25A-FXS engine.

Example:

Toyota documentation can be confusing. It wouldn't be Toyota if it wasn't. Case in point: in odd Toyota fashion, circuits that are common to all engine models will either:

1. Make no distinction between engines.
2. Show each engine individually.

 

Thanks a lot for detail information.