Description And Operation: Operation

• The Adaptive Cruise Control (ACC) module receives battery voltage on a fused ignition switch output (run) circuit.
• The ACC module is grounded at all times through a hard wired remote ground point.
• The ACC module operates only when the ignition switch is in the ON position.
• The ACC module receives electronic speed control switch status message inputs from the Steering Column Control Module (SCCM) over the Controller Area Network (CAN) data bus.
• The module also monitors electronic message inputs from the:
  • Powertrain Control Module (PCM)
  • Antilock Brake System (ABS) Module
  • Transmission Control Module (TCM)
• The ACC module processes all of those inputs, then provides the appropriate electronic message outputs over the CAN data bus to the PCM, the TCM and the ABS to control and maintain the separation setting selected by the vehicle operator between the vehicle and any preceding vehicles.

The ACC module is also a Radio Detection And Ranging (RADAR) transceiver:

• The ACC module transmits electromagnetic signal bursts at an operating frequency of 77 gigahertz.
• Those signal bursts are scattered by any objects they strike within the 40 degree field of view of the transceiver, which changes the strength and frequency of the signal.
• The ACC module antenna receives and interprets the returned signals to detect any objects in the path of the vehicle as well as their speed and direction.

The module also contains an electronic ambient temperature module and a heating element. When appropriate ambient temperatures are sensed, the heating element is energized by the ACC module control circuitry to keep the module lens or radar dome clear of ice and snow accumulations that might otherwise blind the module to proper reception of returned signals.