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DTC U1XXX: Lost Communication With XXX: Testing

  1. Check for short to ground in positive battery voltage circuits and ignition voltage circuit(s) of module(s) not communicating. Repair as necessary. After repair, go to step  8 . If battery and ignition voltage circuit(s) are okay, go to next step.
  2. Turn ignition switch to OFF position. Check ground circuit(s) of module(s) not communicating, for open or high resistance. Repair as necessary. After repair, go to step  8 . If ground circuit(s) are okay, go to next step.
  3. Disconnect splice pack SP205. Check for poor terminal contact at splice pack harness connector. Repair as necessary. After repair, go to step  7 . If terminal contact is okay, go to next step.
  4. Check class 2 serial data circuit for open between splice pack connector SP205 and module that is not communicating. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. Repair as necessary. After repair, go to step  7 . If class 2 serial data circuits are okay, go to next step.
  5. Check for poor terminal connections at battery voltage, ignition voltage and ground circuits of module(s) that are not communicating. Repair terminal connections as necessary. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If terminal connections are okay, go to next step.
  6. Replace module that is not communicating. Go to appropriate system for replacement procedures. After repair, go to step  8 .
  7. Connect scan tool to DLC. Turn ignition switch to RUN position. Select DISPLAY DTCs function for module that was communicating. If scan tool does not display any communication DTCs exist (DTCs beginning with a "U"), go to appropriate system diagnostic system check starting point for related system. If any communication DTCs exist, clear all DTCs using scan tool, then go to next step. If other DTCs exist, go to appropriate system starting point for related system.
  8. Select DISPLAY DTCs function for module(s) which had lost communication with xxx set. If any DTCs that do not begin with "U" exist, go to appropriate system diagnostic system check starting point for related system. If no DTCs exist, go to next step.
  9. Select DISPLAY DTCs function for module that stored lost communication with xxx set. If any DTCs other than communication DTCs exist, go to appropriate system diagnostic system check starting point for related system. If no other DTCs exist that are not communication DTCs, go to next step.
  10. Using scan tool, clear DTCs. Repair any DTCs from all modules as necessary.
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