Electronic Control Module (ECM)
WARNING: This page is about a different car, the 1992 Cadillac Allante, 1991 Cadillac Allante, and 1990 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.
Cruise control operation is one of the many functions which the Electronic Control Module (ECM) controls. The ECM receives input signals from the cruise control engagement switches, the instrument panel switch, the brake release switch, throttle position sensor and the speed sensor. The ECM processes these cruise control inputs together with the EFI engine control information and transmits command signals to the vacuum and vent solenoid valves to provide vacuum to the servo to control vehicle speed.