Description And Operation: Operation: Notes

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.

The electric booster heater consists of a matrix, containing ceramic coated positive temperature coefficient elements, which is installed in the climate control assembly.

Operation of the electric booster heater is activated by the Rear Junction Box (RJB) and the two electric booster heater relays, integral with the RJB. The RJB activates the electric booster heater relays to energize combinations of the three electric booster heater elements as required.

The Automatic Temperature Control Module (ATCM) uses the following inputs, to control operation of the electric booster heater:

Climate control system selections from the Integrated Control Panel (ICP) and the Touch Screen (TS), through the High Speed (HS) Controller Area Network (CAN) comfort systems bus to the Body Control Module/Gateway Module (BCM/GWM) assembly and then the High Speed (HS) Controller Area Network (CAN) Power Mode Zero bus.
Ambient air temperature and engine coolant temperature from the Powertrain Control Module (PCM) via the FlexRay network to the Body Control Module/Gateway Module (BCM/GWM) assembly and then the High Speed (HS) Controller Area Network (CAN) Power Mode Zero bus.
Battery state from the BCM/GWM assembly through the High Speed (HS) Controller Area Network (CAN) Power Mode Zero bus.

The ATCM requests operation of the electric booster heater, provided the vehicle is not in transit mode and there are no generator faults recorded, when the following conditions occur:

The engine is running.
The blower is on (any speed).
Heating is requested on the ICP, or on the menu of the TS, and the desired vent temperature (calculated by the ATCM), is not being achieved.

The electrical booster heater elements activated by the ATCM which is proportional to the amount of heating required. If the electrical load management is in force, the electric booster heater performance is reduced.