Functional Description - Central ADAS Decision Module (CADM)

The CADM receives the states of the ACC and the NCC steering wheel switches through a BCM signal when one of the switches are toggled. Once the system is in enabled, ACC/NCC can be engaged by pressing the Set+ or Set- buttons. For either system, the vehicle can be put into (NCC) or is put into (ACC) the ready state at any speed. The NCC has to be above the minimum NCC speed before it will engage. The ACC Set speed is automatically defaulted to the minimum ACC set speed if ACC is engaged below the minimum ACC set speed.

The CADM calculates the vehicle speed to be displayed on the IPC to determine system availability and set speed. The CADM converts a vehicle speed signal that is sent on the CAN bus from the BSCM to the vehicle speed that will be displayed on the digital speedometer on the IPC.

The CADM also provides the IPC with ACC/NCC status and message display requests to be used for the vehicle driver.

The CADM utilizes the following input signals to support the ACC/NCC system. Some of these signals are ACC specific and do not apply to NCC operation.

• 12 volt battery signal from the BCM.
• LRRF for radar data (Radar Info) collection and the LRCF for object data (Camera Data) information.
• Steering wheel angle signals from the EPS.
• Current country from the DSM.
• Wheel spin and speed data from the BSCM.
• Accelerator position from the PCM.
• Air suspension levels from the Air Suspension Control Module (ASCM).
• Vehicle odometer values from the IPC.
• Yaw and latitude readings from the Occupant Restraint Controller (ORC).
• Seat belt buckled/unbuckled from the ORC.
• Door ajar switch state from the BCM.
• Wiper state and wiper speed from the BCM.
• External temperature from the BCM.