GM Service Manual Online
For 1990-2009 cars only

Cellular Telephone Module (w/UV8)

8-Digit GM Part Number: This displays the module part number.

Component Serial Number 13-16: This displays the module serial number.

Julian Date of Build: This displays the day of the year the module was built.

PROM ID: This displays the module PROM I.D.

Year Model Built: This displays the year the module was built.

OnStar® Vehicle Communication Interface Module (VCIM)

8-Digit GM Part Number: This displays the part number for the VIU.

Component Serial Number 13-16: This is the third partition of the serial number.

Electronic Serial Number: This is the electronic serial number stored in the VCU which is used by the OnStar® Call Center.

Julian Date of Build: This displays the day of the year the module was built.

Module I.D. : This displays the version of OnStar® which the vehicle is equipped with.

Software I.D.: This displays the 3-digit number of the software version used on the OnStar® VIU.

VCI Module Station I.D.: This is the station identification number stored in the VIU which is used by the OnStar® Call Center.

Year Module Build: This displays the year the module was built.

Amplifier

Mono Volume Control: This displays the cellular telephone volume in counts. Range: 0-255 counts.

Mute: This displays the state of the audio mute function, on or off, requested by the cellular telephone.

Phone Active: This displays the state, active or inactive, of the cellular telephone.