GM Service Manual Online
For 1990-2009 cars only
Module Information -- PROM ID: This displays the 4-digit number of the PROM incorporated into the driver door module (DDM).

Module Information -- Master Flash ROM ID: This displays the calibration or program revision level used in the Master ROM.

Slave Flash ROM ID: This displays the calibration or program revision level used in the Slave ROM.

Module Information -- Julian Date Of Build: This displays the day of the year the module was built.

Module Information -- Year Module Built: This displays the 4-digit year of build.

Module Information -- 8-Digit GM Part Number: This displays the part number for the Vehicle Interface Unit (VIU).

Module Information -- Component Serial #8-11: This is the first partition of the serial number.

Module Information -- Component Serial #12: This is the second partition of the serial number.

Module Information -- Component Serial #13-16: This is the third partition of the serial number.

Module Information -- Component Serial # 17-18: This is the last partition of the serial number.

GPS Information -- Second: Gives second of current time as transmitted by GPS satellites.

GPS Information -- Hour: Gives hour of current time as transmitted by GPS satellites.

GPS Information -- Day: Gives current day as transmitted by GPS satellites.

GPS Information -- Month: Gives current month as transmitted by GPS satellites.

GPS Information -- Year: Gives current year as transmitted by GPS satellites.

GPS Information -- Minute: Gives current minute as transmitted by GPS satellites.

GPS Information -- Latitude: Gives current position (N/S) as calculated from GPS satellite information.

GPS Information -- Longitude: Gives current position (E/W) as calculated from GPS satellite information.