Battery Voltage: The scan tool displays 0.0-16.0 volts.
  The battery voltage input represents the system voltage measured at the BCM   ignition
feed input.
Ignition Accessory: Input from ignition switch Accessory circuit.
  Used to determine power mode. Hot in ACC and ON.
Ignition 0: 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
Ignition 1: Input to the control module from the ignition  
 switch indicating the Ignition 1 position. Switch closed (HOT) in ignition switch
  positions ON and START
Key in Ignition: Input from ignition switch indicating   that
the ignition key is inserted into the ignition switch. HOT with key in  ignition switch.
Julian Date of Build: The day of the year when module was built.
Seed and Key Timer: Indicates the time remaining for programming
  functions.
Year Module Built: The year when module was built.
8 Digit GM Part Number: The module's part number.