Module, Adaptive Cruise Control (Acc): Operation

• The ACC Radar receives battery voltage on a fused ignition switch output (run) circuit.
• The ACC Radar is grounded at all times through a hard wired remote ground point.
• The ACC Radar operates only when the ignition switch is in the ON position.
• The ACC Radar receives electronic speed control switch status message inputs from the Steering Column Control Module (SCCM) over the Controller Area Network (CAN) data bus.
• The ACC Radar 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 Radar also monitors electronic message inputs from the following modules:

• Powertrain Control Module (PCM)
• Antilock Brake System (ABS) Module
• Transmission Control Module (TCM)

The ACC Radar is also a transceiver. Some of the properties of the Radar operation are:

• transmitting 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.
• able to receive and interpret the returned signals to detect any objects in the path of the vehicle as well as their speed and direction.