WARNING: This page is about a different car, the 1990 Cadillac Seville and 1990 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
If intermittent Code B123 is being set, manipulate circuit No. 685. When BCM input B101 change-of-state indicator displays an "X", check circuit at that location for intermittent fault.