GM Service Manual Online
For 1990-2009 cars only
Battery Voltage: The scan tool displays the battery system voltage.

Last RFA Cmd Since Wake-Up: The scan tool displays the last RFA commanded message from the BCM. The scan tool displays NONE when the BCM awakens from asleep status without receiving a RFA module request from a programmed key fob. The scan tool displays LOCK, UNLOCK or PANIC when the BCM is awake and a command is activated from the key fob to the RFA module.

RFA Message Since Wake-Up: The scan tool displays the last message sent to the BCM from the remote control door lock receiver.