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

Serial Data Class 2


Object Number: 594338  Size: FS
Battery, UAWJB, Fuse Block, Headlamp Switch, Parklamp and Headlamp Relay
Radio, HVAC, RFA, Cluster, Cel Tel, BCM Power, INADV Power Bus, Radio PRM Sound, and Cigar Lighter/Data Link Fuses
SIR Handling Caution
G200
Data Link Communications Components
Data Link Communications Circuit Description
Serial Data E and C
Handling ESD Sensitive Parts Notice
Figure 2:

Serial Data E and C


Object Number: 594340  Size: FS
Handling ESD Sensitive Parts Notice
Data Link Communications Components
Data Link Communications Circuit Description
Serial Data Class 2
Handling ESD Sensitive Parts Notice