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BFC Diagnostic System Check

WARNING: This page is about a different car, the 1997 Oldsmobile Cutlass and 1997 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Reinstall any components that have been removed. Cycle ignition switch from OFF to RUN position, engine off. Connect scan tool. Attempt to establish communication with BFC. If scan tool displays data, go to step 3). If scan tool does not display data, go to next step.
  2. Diagnose and repair problem in DLC. See appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS. Attempt to establish communication with BFC. If scan tool displays data, go to next step.
  3. Select BODY FUNCTIONS. Check for BFC DTCs. If any DTC exists, go to BFC DTC DEFINITION  . If no DTCs exist, go to next step.
  4. Disconnect scan tool. Cycle ignition switch from OFF to RUN position. If all indicators turned on and off, go to step 6). If all indicators did not turn on and off, go to next step.
  5. If any indicator stays on or flashes, go to TROUBLE SHOOTING  . If no indicator stays on or flashes, go to next step.
  6. Check for DTCs. If any history DTC exists, go to next step. If no DTCs exist, system is operating properly.
  7. Using scan tool, retrieve freeze frame and failure records information. Duplicate conditions under which DTC was set. If DTC resets as current, go to BFC DTC DEFINITION  . If DTC does not reset, system is operating properly.
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