Circuit Description
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The Vehicle Speed Sensor (VSS) is mounted on the transaxle. As transaxle turns, VSS provides speedometer with a vehicle speed input through voltage pulses. Each revolution of the axle shaft equals 4 pulses. This input is used to drive the speedometer. The speedometer converts vehicle speed input to a more precise output which is sent to Powertrain Control Module (PCM) and cruise control module, if equipped. PCM sends a 5-volt carrier signal to speedometers vehicle speed output control circuit. On this same circuit, the speedometer produces a pulse width modulated signal that the PCM, and cruise control module use to determine vehicle speed.