DTC B13F4-13: Electric (PTC) Heater Control Circuit #1 - Circuit open: Action

WARNING: This page is about a different car, the 2020 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 electric booster heater relay circuit for open circuit, high resistance. Repair the wiring harness or install a new electric booster heater relay as necessary