Notes on Intermittents
WARNING: This page is about a different car, the 1988 Cadillac Seville and 1988 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
To diagnose an intermittent resume/accel function, turn cruise control dash switch to "ON" position and backprobe ECM pin "B6" with a voltmeter to ground. Terminal "B6" should show 12 volts with turn cruise dash switch to "ON" position and backprobe ECM pin "B4" with a voltmeter to ground. Terminal "B6" should show 12 volts with "RESUME/ACCEL" switch depressed and zero volts with "RESUME/ACCEL" switch released. Cycle switch while manipulating wiring and connectors.