Engine Control Module (ECM)

The following are the ACC system functions performed by the ECM:

• The ECM provides the electronic throttle control to the ACC system. The ECM is also responsible for determining when a driver is overriding the adaptive cruise control throttle position by pressing the accelerator pedal.
• The ECM processes the cruise control switch requests received via the GMLAN serial data circuit from the BCM. Engaging and disengaging the ACC system are functions performed by the ECM.
• The ECM determines the driver selected vehicle speed. Unless the ACC module requests a lower vehicle speed, the ECM will control the vehicle speed to the driver selected set speed.
• The ECM allows automatic braking without disengaging the ACC.