Engine Control Module
WARNING: This page is about a different car, the 2001 Saturn LW300, 2001 Saturn L300, 2000 Saturn LW2, and 2000 Saturn LS2. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM) processes switch inputs indicating that the driver has requested cruise control. In response to these inputs, ECM regulates throttle angle and other factors to maintain set speed. ECM also receives signals directly from cruise brake and brakelight switches to disengage cruise control.