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 enter the service mode, turn the ignition switch to the "ON" position. Touch the "OFF" and "WARM" buttons on the ECC control panel simultaneously, and hold until a segment check is displayed on the instrument panel and ECC control panel. See Fig 1 .