Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Circuit Operation

The vehicle speed sensor (VSS) generates a signal indicating the speed of the car, and applies it to the gauge assembly, cruise control unit. transmission control module, and engine control module (ECM). These components then use the signal as a reference in controlling certain functions of their circuits.