Speedometer and Odometer

The Vehicle Speed Sensor (VSS) is a gear-driven permanent magnet generator housed in the vehicle's transaxle. This sensor generates a sine wave output with a frequency proportional to vehicle speed. The Powertrain Control Module (PCM) converts this signal to an output that is switched to ground at a frequency of 4000 pulses per mile. This signal (circuit 817) drives the speedometer and odometer and is used by other vehicle systems.

The season odometer displays the total accumulated kilometers (miles) of the vehicle. This value is permanently stored in the Electronically Erasable Programmable Read Only Memory (EEPROM) of the instrument cluster. If an odometer malfunction occurs, or if the instrument cluster must be replaced, an authorized Delco(R) service center must be contacted to program proper vehicle specifics (including mileage) to the instrument cluster.

The trip odometer displays the accumulated kilometers/miles to the tenths of a kilometer/mile since the last reset. This value is stored in Keep Alive Memory (KAM) of the instrument cluster. The trip odometer may be reset by pressing the RESET button on the trip odometer reset switch. If the RESET button is not used to reset the trip odometer, the display will roll over automatically as follows:
^ The trip odometer will roll over at 999.9 miles when operated in English mode and at 999.9 Km in metric mode.
^ When the trip odometer is displaying more than 621.4 miles (operating in english mode) and the english/metric button is pressed, the trip odometer will reset to zero and display Km values. If the english/metric button is pushed again the cluster will convert the displayed Km value into miles.