Speedometer, Odometer & Trip Odometer

The Vehicle Speed Sensor (VSS) sends electrical pulses to the Powertrain Control Module (PCM) at the rate of 40,000 pulses per mile. PCM buffers this signal and sends it to the BCM. BCM computes speed and total miles traveled. Odometer data is stored in the non-volatile memory. Trip odometer data is stored in the resettable keep-alive memory. BCM sends data line information to the IPC. Vehicle speed, total accumulated miles, and trip miles are displayed. Mileage memory is in the BCM.