Up to VIN S5219999

The operation of the low fuel indicator is stated below. For other indicators, see the system indicated by the circuit schematics.

Low fuel indicator (part of instrument cluster)
The thermistor is mounted in the fuel tank as part of the fuel gauge sender. When the thermistor is cool, its resistance is very high. When the thermistor is warm, its resistance lowers. Fuel in the fuel tank transfers heat away from the thermistor fast enough to keep it cool. The thermistor resistance stays high and the low fuel warning light does not operate. When the fuel level drops below about 2.6 gallons, the thermistor is no longer immersed in fuel. Without the fuel to cool it, the thermistor resistance becomes low. Current flows through the low fuel warning light and the thermistor to ground. The low fuel warning indicator lights up.