Data Link Communication System

• Schematic and Routing Diagrams
  • Data Link Communications Schematic Icons
  • Data Link Connector (DLC) Schematics
• Component Locator
  • Data Link Communications Connector End Views
• Diagnostic Information and Procedures
  • Diagnostic Starting Point - Data Link Communications
  • Diagnostic Trouble Code (DTC) List
  • DTC U1000 and U1255
    • Circuit Description
    • Conditions for Running the DTC
    • Conditions for Setting the DTC
    • Action Taken When the DTC Sets
    • Conditions for Clearing the DTC
    • Diagnostic Aids
    • Test Description
  • DTC U1001-U1254
    • Circuit Description
    • Conditions for Running the DTC
    • Conditions for Setting the DTC
    • Conditions for Clearing the DTC
    • Diagnostic Aids
    • Test Description
  • DTC U1300, U1301, or U1305
    • Circuit Description
    • Conditions for Running the DTCs
    • Conditions for Setting the DTCs
    • Action Taken When the DTCs Sets
    • Conditions for Clearing the DTC
    • Diagnostic Aids
  • DTC U2100
    • Circuit Description
    • Conditions for Running the DTCs
    • Conditions for Setting the DTC
    • Action Taken When the DTCs Sets
    • Conditions for Clearing the DTC
    • Diagnostic Aids
  • DTC U2103 or U2104
    • Circuit Description
    • Conditions for Running the DTCs
    • Conditions for Setting the DTC
      • U2103
      • U2104
    • Action Taken When the DTCs Sets
    • Conditions for Clearing the DTC
    • Diagnostic Aids
  • DTC U2105-U2199
    • Circuit Description
    • Conditions for Running the DTC
    • Conditions for Setting the DTC
    • Action Taken When the DTC Sets
    • Conditions for Clearing the DTC
    • Test Description
  • Symptoms - Data Link Communications
    • Notes
    • Visual/Physical Inspection
    • Intermittent
    • Symptom List
  • Scan Tool Does Not Power Up
    • Circuit Description
    • Test Description
  • Scan Tool Does Not Communicate with Class 2 Device
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Scan Tool Does Not Communicate with High Speed GMLAN Device
    • Notes
    • Diagnostic Aids
  • Scan Tool Does Not Communicate with Low Speed GMLAN Device
    • Notes
    • Diagnostic Aids
  • Data Link References
    • Data Link References
• Description and Operation
  • Data Link Communications Description and Operation
    • Circuit Description
    • GMLAN Circuit Description
    • Class 2 Circuit Description
    • Data Link Connector (DLC)
    • GMLAN Serial Data Line
    • Class 2 Serial Data Line