Odometer: Description and Operation

When the ignition is in ON (II) or START (III) battery voltage is supplied through fuse 13 to the gauges in the gauge assembly.

Speedometer and Odometers
With the ignition in ON (II) or START (III), the trip/total odometer driver and the speedometer driver in the gauge assembly are supplied battery voltage through fuse 13. The trip/total odometer driver applies voltage to the speed input terminal (YEL/RED wire). The Vehicle Speed Sensor (VSS) creates a pulsing in the YEL/RED wire by switching its connection to ground ON and OFF. The number of pulses increases as speed increases. The trip/total odometer driver uses this input to drive the trip and odometer stepper motors, and also supplies it to the speedometer driver to control the speedometer.