1998 Oldsmobile Cutlass BaseFACTORY OEM SERVICE PROCEDURE

BFC Diagnostic System Check

  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 WIRING DIAGRAMS  . Attempt to establish communication with BFC. If scan tool displays data, go to next step.
  3. Using scan tool, select BODY FUNCTIONS. Check for BFC DTCs. If any DTC exists, go to BFC DTC DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM. 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. Start engine. 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 DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM. If DTC does not reset, system is operating properly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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