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

Headliner Harness Routing


Object Number: 1344966  Size: MF
(1)Inside Rearview Mirror (ISRM)
(2)Courtesy/Map Lamps
(3)Sunroof Switch
(4)Cellular Telephone Microphone
(5)Dome Lamp - Front
(6)Dome Lamp - Rear
(7)S302
(8)S303
(9)C302 - Sunroof Harness to Headliner Harness Connector
(10)S301
(11)C300 - Body Harness to Headliner Harness Connector
(12)C303 - Headliner Harness to I/P Harness Connector
Figure 2:

Computer/Integrating System Components


Object Number: 1544565  Size: MF
(1)Powertrain Control Module (PCM) (L66), Engine Control Module (ECM) (L61)
(2)Power Steering Control Module (PSCM)
(3)Body Control Module (BCM), Radio
(4)Door Latch - Front Passenger, Rest Similar
(5)Inflatable Restraint Sensing and Diagnostic Module (SDM)
(6)Liftgate Latch
(7)Data Link Connector (DLC)
(8)Vehicle Communication Interface Module (VCIM)
(9)Instrument Panel Cluster (IPC)
(10)Transmission Control Module (TCM) (L61 w/4T45-E)
(11)Passlock Sensor
(12)Transmission Control Module (TCM) (L61 w/VT25-E)
(13)Electronic Brake Control Module (EBCM)
Figure 3:

Cellular/Navigation Antenna


Object Number: 1702882  Size: MF
(1)Cellular/Navigation Antenna