Scan Tool Does Not Communicate With Class 2 Data Line: Notes
WARNING: This page is about a different car, the 1999 Buick Regal and 1999 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
To identify wire colors and modules on serial data lines, see appropriate wiring diagram in DATA LINK CONNECTORS article in
WIRING DIAGRAMS.