Speedometer Head: Description and Operation

SPEEDOMETER

On a vehicle without ABS, the instrument panel cluster (IPC) displays the vehicle speed based on the information from the vehicle speed sensor (VSS) indicating the vehicle speed. On an All Wheel Drive (AWD) vehicle with ABS, The IPC calculates the vehicle speed based on the message indicating the wheel reference speed from both front wheel speed sensors. The wheel speed sensor signal is sent to the IPC through the electronic brake control module (EBCM).