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Class 2 Communication Malfunction: Testing

  1. Connect scan tool to DLC. Select DISPLAY DTCs for each module. Record each DTC, DTC status and module stored in. If any DTC between U1000 and U1096 exist with a history status, go to DTC U1XXX: LOST COMMUNICATION WITH XXX  . If no DTCs between U1000 and U1096 exist, go to next step. If other DTCs exist, go to appropriate system starting point for related system.
  2. Turn ignition switch to RUN position. Attempt to communicate with each module on Class 2 serial data circuit (PCM, EBCM, SDM, IPC, BCM and Heater-A/C Control). If communication does not exist with any module(s), go to next step. If communication exists with all modules, go to step  11 .
  3. Check positive battery voltage circuits and ignition voltage circuit(s) of module(s) not communicating, for short to ground. Repair as necessary. After repair, go to step  9 . If battery and ignition voltage circuit(s) are okay, go to next step.
  4. 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  9 . If ground circuit(s) are okay, go to next step.
  5. Disconnect splice pack SP205. Check for poor terminal contact at splice pack harness connector. Repair as necessary. After repair, go to step  9 . If terminal contact is okay, go to next step.
  6. 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  9 . If class 2 serial data circuits are okay, go to next step.
  7. 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.
  8. Replace module that is not communicating. Go to appropriate system for replacement procedures. After repair, go to step  11 .
  9. 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, go to next step. If other DTCs exist, go to appropriate system starting point for related system.
  10. Using scan tool, clear all DTCs. Select DISPLAY DTCs function for module that was communicating. If scan tool displays any DTCs that do not begin with "U", go to appropriate system diagnostic system check starting point for related system. If no communication DTCs exist (DTCs beginning with a "U"), system is okay at this time.
  11. If any current communication DTCs exist (DTCs beginning with a "U"), go to appropriate system diagnostic system check starting point for related system. If no current communication DTCs exist, go to next step.
  12. Connect scan tool to DLC. Turn ignition switch to RUN position. Clear all DTCs. Turn ignition to OFF position for 5 seconds. Turn ignition switch to RUN position. Select DISPLAY DTCs function. If DTC U1000 exists as a current DTC, go to next step. If DTC U1000 does not exist as a current DTC, go to DIAGNOSTIC AIDS  .
  13. Replace module that had DTC U1000 set as current DTC. Clear DTCs. Retest system.
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