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.
Module Part Number: Indicates the module part number.
Seed and Key Timer: Indicates the time remaining for   programming
  functions.
Software Part Number: Part number of component program   or
  the ECU. Used to determine  applicability to vehicle RPO content.