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

Data Link Connector (DLC) and Splice Pack SP205


Object Number: 747277  Size: MF
(1)Data Link Connector
(2)Splice Pack SP205
Figure 2:

Splice Pack SP306


Object Number: 747280  Size: MF
(1)Splice Pack SP306
(2)Rear Floor Panel
(3)Body Harness