DTC B1479-98: Power Supply Distribution Box - Component or system over temperature: Action

WARNING: This page is about a different car, the 2018 Land Rover Range Rover and 2017 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

Refer to the appropriate system wiring diagrams and check the power supply distribution box circuit for short circuit to ground, open circuit, high resistance. Repair the wiring harness as necessary
Using JLR approved diagnostic equipment, clear the DTCs, lock the vehicle and wait two minutes. Unlock the vehicle and run the engine for five minutes with all electrical loads switched on. If the fault persists, install a new power supply distribution box