Power and Signal Distribution

All Description and Operation

• Data Link Communications Description and Operation

Diagnostic Procedures

• Diagnostic Starting Point - Data Communications
• Scan Tool Does Not Communicate with Class 2 Device
• Scan Tool Does Not Communicate with High Speed GMLAN Device
• Scan Tool Does Not Power Up
• Symptoms - Data Communications

Diagnostic Trouble Codes

• DTC U0100-U0299
• DTC U0294
• DTC U1000 and U1255
• DTC U1001-U1254
• DTC U1300, U1301, or U1305
• DTC U2104
• DTC U2106
• DTC U2108

Electrical/Electronic Schematic Diagrams

• Data Communication Schematics

Removal, Installation, and Replacement

• Serial Data Gateway Module Replacement