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

Data Link Communication (DLC)


Object Number: 581812  Size: LF
(1)Data Link Connector (DLC)
(2)SP205 (Splice Pack)
Figure 2:

Lower Center of IP, Right of Steering Wheel


Object Number: 487935  Size: LF
(1)G203
(2)C215 (Inline to SIR Steering Wheel Module)
(3)Data Link Connector (DLC)
(4)C201 (Inline to Steering Column Harness)
(5)Stop Lamp Switch Connector
(6)Cruise Control Release Switch Connector
(7)Cruise Control Release Switch
(8)G201