Chart B, Abs Lamp "On"
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1990 Pontiac Bonneville, 1990 Oldsmobile Ninety-Eight, 1990 Oldsmobile Eighty-Eight, 1990 Cadillac Fleetwood, and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Use this chart as directed by the ABS FUNCTIONAL CHECK when the "ANTI-LOCK" lamp is on, the "BRAKE" lamp is off, no ABS Codes are present and the system is operating with a normal level of power assist. Key areas in chart include: Sources of EBCM power, EBCM grounds and low fluid/low pressure loop.