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

DLC Pins 4, 16, 5, and 2


Object Number: 603912  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
DLC Pins 8 and 12
Underhood Fuse Block Fuse V5 and Fuse Block Fuses 6, 7, 20, and 25
Fuse Block Fuses 4, 12, 21, and 32
G103 (8 of 8)
G103 (7 of 8)
G103 (6 of 8)
G103 (1 of 8)
Figure 2:

DLC Pins 8 and 12


Object Number: 603953  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
DLC Pins 3 and 7
DLC Pins 2, 4, 5, 16
Data Link Communications Schematic Icons
Figure 3:

DLC Pins 3 and 7


Object Number: 603957  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Serial Data and CAN Interface
DLC Pins 8 and 12
Figure 4:

Serial Data CAN Interface


Object Number: 556670  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
DLC Pins 3 and 7
Data Link Communications Schematic Icons
Data Link Communications Schematic Icons
Data Link Communications Schematic Icons