Toronado Models
WARNING: This page is about a different car, the 1986 Oldsmobile Toronado and 1986 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
To exit out of the "Service Mode", press the "BI-LEV" button. Trouble codes are not erased when this is done. Any mode button will exit diagnostics, however, the "BI-LEV" button was chosen for consistency.