If you have a second battery it will be in the trunk behind the left-hand side (driver side) Trim panel. Not that its important right now, buts it's good to know if you do have one in case of future issues. The wiring diagram is saying it might have one. There's a lot of different changes depending on the different model/sub models.
But anyway. since you don't have a circuit breaker set for 12v automotive use.
You would have to put another 5-amp fuse in and run the car, take it for a ride, make some turns left and right. Come back and without trying any switches or the key FOB, recheck that 5-amp fuse. You can take it out or test it with an automotive 12-volt test light or multimeter. I will leave a guide on using a 12volt test light below. They're very simple to use, you would just hook the test light up the battery negative and touch the test light to each side of the fuse. If both sides light up the fuse is not blown.
If the fuse does blow without you attempting to open the trunk, then it's a short somewhere from the battery to the Trunk unlatch Relay because without activating the relay, that's where the circuit ends. as in the diagram. That would mean that the short is in the engine compartment somewhere because that Relay is in the Under-hood Fuse Block.
If you come back from your test drive and take the fuse out, which will be easiest for you to do, and it's not blown. Put it back in and try to open the trunk with the interior switch. We'll see if that blows the fuse.
Then we will have to track down the problem. You are going to need a multimeter to check the circuits. Short circuits to Ground can be hard to find if you have never tried to find one before. You may want to get a few 5-amp fuses if you plan on trying to find this short circuit yourself.
If you are able, can you take a picture of the fuse box with the cover off and a little bit of the surrounding area? Im only asking just incase I can spot something obvious..
Sorry for the long message, I just want to give you as much direction as possible ahead of time.
Just added a diagram showing the end of the circuit.
One last thing can just check that the carpets are not wet down in front of the front seats, both sides. Just a precaution.
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-check-wiring
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Images (Click to make bigger)
Monday, October 25th, 2021 AT 1:59 PM