GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Bonneville 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Data Link Connector Schematics
Figure 1:

Cell 50: Data Link Connector (DLC)
Object Number: 343123 Size: FS
Data Link Communications Components
Data Link Communications Description
Cell 50: UART Serial Data Line
Cell 50: Class 2 and E&C Serial Data Lines
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Power Distribution Schematics
Power Distribution Schematics
Ground Distribution Schematics
Ground Distribution Schematics
Figure 2:

Cell 50: UART Serial Data Line
Object Number: 343101 Size: FS
Data Link Communications Components
Data Link Communications Description
Cell 50: Class 2 and E&C Serial Data Lines
Cell 50: Data Link Connector (DLC)
Handling ESD Sensitive Parts Notice
Cell 50: Data Link Connector (DLC)
SIR Handling Caution
Figure 3:

Cell 50: Class 2 and E&C Serial Data Lines
Object Number: 343121 Size: FS
Data Link Communications Components
Data Link Communications Description
Cell 50: UART Serial Data Line
Handling ESD Sensitive Parts Notice
Cell 50: Data Link Connector (DLC)
Data Link Communications Connector End Views