WARNING: This page is about a different car, the 2002 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cellular Telephone Interface Board
Courtesy of GENERAL MOTORS CORP.
Fig 2: Cellular Telephone Module (1 Of 2)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Cellular Telephone Module (2 Of 2)
Courtesy of GENERAL MOTORS CORP.
Fig 4: Vehicle Communication Interface Module (VCIM) C1
Courtesy of GENERAL MOTORS CORP.
Fig 5: Vehicle Communication Interface Module (VCIM) C2
Courtesy of GENERAL MOTORS CORP.
Fig 6: Vehicle Communication Interface Module (VCIM) C3