GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Overhead Console Components (C3U)


Object Number: 1867858  Size: LF
(1)Courtesy/Reading Lamp - Front
(2)Sunroof Shade Switch (C3U)
(3)Console Flood Lamp
(4)Garage Door Opener (UG1)
(5)Sunroof Switch (C3U)
Figure 2:

Headliner Components


Object Number: 1863126  Size: LF
(1)Cargo Lamp
(2)Courtesy/Reading Lamp - Rear
(3)Infrared Module (U42 with C3U)
(4)Courtesy/Reading Lamp - Center (U42 with C3U)
(5)Digital Video Disc (DVD) Display (U42 with C3U)
(6)Cellular Microphone (UE1)
(7) Courtesy/Reading Lamp - Front
(8)Console Flood Lamp
(9)Garage Door Opener (UG1)
(10)Vanity Mirror Lamp - Right (DH6)
(11)Inside Rearview Mirror
(12)Vanity Mirror Lamp - Left (DH6)
(13)Digital Video Disc (DVD) Display (U42 without C3U)
(14)Courtesy/Reading Lamp - Center (without C3U)
(15)Infrared Module (U42 without C3U)
(16)Rear Parking Assist (RPA) Display (UD7)
(17)Remote Control Door Lock Receiver (RCDLR)