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BCM Diagnostic System Check: Testing

  1. Turn ignition off. Connect scan tool. Turn ignition on. Attempt to establish communication with BCM. If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, go to step 3).
  2. Using scan tool, check for BCM DTCs. If any DTC exists, go to BCM DTC DEFINITION  . If no DTCs exist, system is operating properly.
  3. Attempt to establish communication with other systems connected to same serial data line (PCM, RFA, IPC, etc.). If scan tool communicates with other systems, go to next step. If scan tool does not communicate with other systems, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DATA LINE  .
  4. Ensure ignition is on. Using a test light connected to ground, probe each BCM fuse and ground. If test light illuminates at all circuits, go to next step. If test light does not illuminate at all circuits, go to step 9).
  5. Turn ignition off. Disconnect BCM connectors C1, C2 and C3. Turn ignition on. Using a test light connected to ground, probe each BCM power circuit. If test light illuminates at all circuits, go to next step. If test light does not illuminate at all circuits, go to step 11).
  6. Using a test light connected to battery, probe each BCM ground circuit. If test light illuminates at all circuits, go to next step. If test light does not illuminate at all circuits, go to step 12).
  7. Using DVOM, check for continuity between BCM harness connector C1 terminal B6 (Light Green 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 10).
  8. Replace BCM. See REMOVAL & INSTALLATION  . Reprogram BCM. See BCM PROGRAMMING/RPO CONFIGURATION  . Go to step 13).
  9. Repair open in ignition or battery feed to BCM fuse. If any fuse is open, locate and repair short in associated circuit. See WIRING DIAGRAM  . Go to step 13).
  10. Locate and repair open in Light Green or Purple wire between BCM connector C1 and DLC. Go to step 13).
  11. Locate and repair open in BCM power circuit. Go to step 13).
  12. Locate and repair open in BCM ground circuit. Go to step 13).
  13. Turn ignition off. Reinstall all components or connectors. Clear DTCs. Ensure system is operating properly.
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