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

Left Front of the Vehicle (L18 w/JE4, LG4, LG5)


Object Number: 1897740  Size: LF
(1)Electronic Brake Control Module (EBCM)
(2)Data Link Resistor 2
Figure 2:

Behind the Left Side of the I/P


Object Number: 1897738  Size: LF
(1)I/P Carrier
(2)Serial Data Gateway (SDG) Module (L18 w/JE4, LG4, LG5)
(3)Controller Area Network (CAN) Connector (L18 w/JE4, LG4, LG5)
(4)Data Link Connector (DLC)
(5)Data Link Resistor 1 (L18 w/JE4, LG4, LG5)
(6)Data Link Resistor (L18, LLY)