Charts A-2 To A-4: Main Relay CKT
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1988 Oldsmobile Ninety-Eight, 1988 Oldsmobile Delta 88, 1987 Oldsmobile Ninety-Eight, 1987 Oldsmobile Delta 88, and 1986 Oldsmobile Ninety-Eight. However, it is still accessible from the selected car via links, so may be relevant.
- Main relay circuit provides battery voltage to ECBM to power main valve, solenoid valves, logic circuit and some self- diagnosis circuits. Main relay coil receives power from ECBM pin No. 8.
- ECBM does not apply power to main relay coil until after ECBM receives ignition enable circuit information. Relay is grounded at ABS ground junction, located on left fender rail. Power for main relay comes through a fusible link from battery junction box.