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IPC Diagnostic System Check: Testing

  1. Turn ignition off. Connect scan tool. Turn ignition on. Attempt to establish communication with IPC. If scan tool communicates with IPC, go to next step. If scan tool does not communicate with IPC, go to step 3).
  2. Using scan tool, select IPC DTC function. Check for IPC DTCs. If any DTC exists, go to appropriate DTC test. If no DTCs exist, go to step 4).
  3. Attempt to establish communication with other systems connected to same serial data line (PCM, RFA, BCM, etc.). If scan tool communicates with other systems, go to step 6). If scan tool does not communicate with other systems, go to SCAN TOOL DOES NOT COMMUNICATE WITH SERIAL DATA LINE  .
  4. Check for any warning messages displayed on IPC. If any warning messages are displayed, go to WARNING/STATUS MESSAGE DISPLAY MESSAGES  under SELF-DIAGNOSTIC - SYSTEM. If no warning messages are displayed, go to next step.
  5. Ensure indicators are operating properly. If indicators are operating properly, system is operating properly. If indicators are not operating properly, go to SYMPTOM TESTING  .
  6. Ensure ignition is on. Using a test light connected to ground, probe each IPC fuse. See WIRING DIAGRAMS  . If test light illuminates at all circuits, go to next step. If test light does not illuminate at all circuits, go to step 11).
  7. Turn ignition off. Disconnect IPC connector. Turn ignition on. Using a test light connected to ground, probe each IPC power circuit. See WIRING DIAGRAMS  . If test light illuminates at all circuits, go to next step. If test light does not illuminate at all circuits, go to step 13).
  8. Using a test light connected to battery, probe each IPC ground circuit. See WIRING DIAGRAMS  . If test light illuminates at all circuits, go to next step. If test light does not illuminate at all circuits, go to step 14).
  9. Using DVOM, check for continuity between IPC connector (harness side), terminal A11 (Gray wire) and Data Link Connector (DLC) terminal No. 2 (Purple wire). If continuity exists, go to next step. If continuity does not exist, go to step 12).
  10. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. Go to step 15).
  11. Repair open in ignition feed to IPC fuse. If any fuse is open, locate and repair short in associated circuit. See WIRING DIAGRAMS  . Go to step 15).
  12. Locate and repair open in Gray or Purple wire between IPC connector, star connector No. 1 and DLC. Go to step 13).
  13. Locate and repair open in IPC power circuit. Go to step 15).
  14. Locate and repair open in IPC ground circuit. Go to next step.
  15. Turn ignition off. Reinstall all components or connectors. Clear DTCs. Ensure system is operating properly.
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