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The signal for the fuel level comes from a sender unit that is mounted inside the fuel
tank and connected to the Interface Module. The sender unit contains a float device
attached to a variable resistor. As the fuel level drops, the float drops and the resis-
tance of the variable resistor increases. The Interface Module converts the resistance
into data that it places on the private data bus. Connections are shown in Figure 3-12.
Light-emitting diodes (LEDs) permanently mounted inside the gauge provide
backlighting. The LEDs are not replaceable. Theyreceive power from a dimming con-
trol located on the vehicle dash, and that power is passed from one gauge to the next
through the 5-wire cable assemblies. If a gauge's backlighting fails, the gauge must
be replaced. More information is available in Chapter 5.
Backlight power for the SMC comes from the same source used for the gauge
backlighting.
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