An old poorly fitted immobiliser or alarm is my guess. Or if it's an import, terrible wiring on the rear fog light is another possibility.
It has an aftermarket immobiliser so maybe it's this. Will have to try and find someone to either hold the multimeter or pull fuses. Or see if jump leads reach from the boot to the fuse box.
Crocodile clips are your friend in these situations. Particularly the ones with a hole you can insert the stabby point multimeter probes into.
@root started
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An old poorly fitted immobiliser or alarm is my guess. Or if it's an import, terrible wiring on the rear fog light is another possibility.