1986 Buick Riviera BaseFACTORY OEM SERVICE PROCEDURE

Toronado Models

Selecting the reset codes will result in the message "CLEAR ECM CODES?" or "CLEAR BCM CODES?", depending on which system was being tested. At this time, the following action may be taken:

  • Pressing the "OFF" button will stop the test selection process and return the display to the next available test type for the selected system.
  • Pressing the "LO" fan button will display the next test type.
  • Pressing the "HI" fan button will select "CLEAR CODES". A message "ECM CODES CLEARED" or "BCM CODES CLEARED" will appear to indicate those codes have been cleared from memory.
  • Pressing the "BI-LEV" button will exit diagnostics.

Factory Service Tools

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When to See a Mechanic

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

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

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