HEATER, Fuel: Operation: Operation
WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The fuel heater is used to prevent diesel fuel from waxing during cold weather operation.
When the fuel temperature is below 32° F (0° C), the temperature sensor allows current to flow to the heater element warming the fuel. When the fuel temperature is above 64° F (18° C), the sensor stops current flow to the heater element.
Battery voltage to operate the fuel heater element is supplied from the ignition switch and through a solid stated device in the TIPM. The fuel heater element and "solid state device in TIPM" are not computer controlled. The heater element operates on 12 volts, 300 watts at 0° F (-18° C).