Scan Tool Data Definitions

The scan tool displays 0.0-16.0 volts. The battery voltage input represents the system voltage measured at the body control module (BCM) ignition feed input.

Input from ignition switch Accessory circuit. Used to determine power mode. Hot in ACC and ON.

Input to the control module from the ignition switch indicating the Ignition 0 position. Switch closed (HOT) in ignition switch positions UNLOCK, ACC, ON, and START

Input to the control module from the ignition switch indicating the Ignition 1 position. Switch closed (HOT) in ignition switch positions ON and START

Input from ignition switch indicating that the ignition key is inserted into the ignition switch. HOT with key in ignition switch.