Glow Plug Control Module
The glow plug control module is located on the right side of the engine compartment.
The glow plug control module has a supply from the Battery Junction Box (BJB) and an earth lead connection. The Powertrain Control Module (PCM) controls the operation of the glow plug control module which activates the glow plugs via Field Effect Transistors (FET) within the module. The PCM controls the illumination of the glow plug indicator in the Instrument Cluster (IC). This is done by signals sent on the High Speed (HS) Controller Area Network (CAN) powertrain bus.
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 the event of glow plug failure, the engine may be difficult to start and excessive smoke emissions may be observed after starting.