DTC 18 - Discriminating Sensor Interconnect Open: Description
WARNING: This page is about a different car, the 1995 Pontiac Sunfire and 1995 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
During INITIATOR ASSEMBLY RESISTANCE tests, DERM first grounds DRIVER-SIDE LOW terminal B8, then monitors voltage at both DRIVER-SIDE LOW and PASSENGER-SIDE LOW. DERM then grounds PASSENGER-SIDE LOW terminal B7 and again measures voltage at DRIVER-SIDE LOW and PASSENGER-SIDE LOW.