ECM Input Code EI80 - Cruise Control Set/Coast Input: Notes
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.
Cruise control "SET/COAST" switch is normally open, providing a 12-volt signal to ECM pin "B4" when switch is depressed. When cruise control dash switch is depressed to "ON" position, the dash switch provides a 12-volt signal to the cruise control/steering column switch on pin "A4" of circuit No. 397. When "SET/COAST" button is depressed, the steering column switch pin "A4" is connected to pin "E3" of circuit No. 84, providing the ECM with a 12 volt input on pin "B4".