GM Service Manual Online
For 1990-2009 cars only
Battery Voltage: The scan tool displays the current state of the battery in volts.

Last RFA Cmd Since Wake-Up: The scan tool displays the last RFA commanded message from the body control module (BCM). The scan tool displays NONE if the BCM wakes-up without receiving a remote control door lock receiver (RCDLR) request from a programmed keyless entry transmitter. When any button is pressed on the transmitter after the BCM wake-up, the scan tool displays the most recent command.

RFA Message Since Wake-Up: The scan tool displays the last message sent to the BCM from the RCDLR.