Glow Plug Control Module
WARNING: This page is about a different car, the 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The glow plug control module has a battery power supply from the Battery Junction Box (BJB) and an earth lead connection. The ECM controls the operation of the glow plug relay which is located in the glow plug control unit. The glow plug relay controls the illumination of the glow plug indicator in the Instrument Cluster (IC).
The system is a low-voltage glow system. At 7 volts, the nominal voltage of the sheathed-element glow plugs is significantly lower than the 12 volts of the main electrical circuit.
In there is a glow plug failure, the engine may be difficult to start and you may see excessive smoke emissions after starting.