Adaptive Speed Control

Quick Overview: 

• Utilizes Radar and camera sensors to identify vehicles in forward path and maintains a selectable distance between the vehicle and the one in front of it;
• ACC with stop and go has full functionality between 0 and 100 mph;
• After ACC with stop and go brings the vehicle to a stop, the driver must indicate the intention to resume by either pressing the resume button or tapping the accelerator pedal;
• Driver can select one of four following distances depending on driver preference.

Functional Overview -  The optional ACC Plus (ACC +)  system (also known as ACC Stop and Go) has functionality beyond that of Normal Cruise Control and Adaptive Cruise Control. This system has the functionality of the cruise control system of maintaining a driver defined Set Speed without the driver needing to press the throttle. This system also has the functionality of the regular ACC system of increasing and decreasing the vehicle speed based on target vehicles moving slower than the ACC Set Speed. Beyond the functionality of the regular ACC system, this system offers a larger operational speed range, which constitutes of speeds from 0 mph to a configurable upper bound. If a target vehicle comes to a standstill, the ACC+ system will also bring the ACC+ host vehicle to a stop, and will keep the vehicle at a standstill for an undetermined period of time by first applying the brakes, and after the brakes time-out, cancelling the ACC+ system and applying the Electronic Park Brake (EPB). The ACC with stop and go system will also incorporate Forward Collision Warning-Plus (FCW). With grade braking, the transmission will automatically downshift to maintain selected vehicle speed and distance, preventing overheating of brakes.

The ACC sensor, the FFC, the ABM, the EMIC, the EVIC, the PCM and the SCCM each contain a microcontroller and programming that allow them to communicate with each other using the Controller Area Network (CAN) data bus. This method of communication is used by the ACC module to provide inputs to the ABM, the EVIC and the PCM. This is also is used by the ABM to provide inputs to the PCM, by the SCCM microcontroller to relay the status of the speed control switches to the PCM and by the PCM for control of the indicators in the EMIC and the indications in the EVIC. Refer to COMMUNICATION, DESCRIPTION .

The ACC with stop and go system used also incorporates grade braking and Forward Collision Warning-Plus (FCW). With grade braking, the transmission will automatically downshift to maintain selected vehicle speed and distance, preventing overheating of brakes.

The optional equipment ACC+ system includes the following major components, which are described in further detail elsewhere in this service information:

• Adaptive Speed Control Module  - An Adaptive Cruise Control (ACC) module (also known as the Adaptive Cruise Control/ACC sensor or radar sensor or module) is located on a bracket secured near the center of the underside of the front bumper support member of the Front End Module (FEM) behind the front fascia. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACC), DESCRIPTION .
• Antilock Brake System Module  - An Antilock Brake System Module (ABS) (also known as Controller Antilock Brake/CAB or the Electronic Stability Control/ESC module) is located on the antilock brake Hydraulic Control Unit (HCU) in the engine compartment. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM (ABS), DESCRIPTION .
• Brake Lamp Sensor  - The brake (also known as stop) lamp sensor is located on the brake pedal support bracket under the driver side of the instrument panel. Refer to SENSOR, STOP LAMP, DESCRIPTION .
• ElectroMechanical Instrument Cluster  - A CRUISE indicator is located in the fixed segment display of the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) that provides an indication to the vehicle operator when the speed control system is turned ON. Refer to DESCRIPTION .
• Electronic Vehicle Information Center  - The Electronic Vehicle Information Center (EVIC) is located in the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) and provides an interface to the vehicle operator for setting the adaptive speed control customer preferences as well as a display of the adaptive speed control and Forward Collision Warning (FCW) system status messages. Refer to CENTER, ELECTRONIC VEHICLE INFORMATION, DESCRIPTION .
• Forward Facing Camera  - The Forward Facing Camera (FFC) is located inside the Combined Rear View Mirror Module (CRVMM) housing assembly. The FFC provides input for data fusion purposes allowing the ACC sensor radar data to be redundancy checked. Refer to MODULE, FORWARD FACING CAMERA (FFCM), DESCRIPTION .
• Powertrain Control Module  - The Powertrain Control Module (PCM) located in the right front corner of the engine compartment contains the software and hardware that monitors all of the speed control system inputs and controls all of the speed control system outputs. Refer to MODULE, POWERTRAIN CONTROL (PCM), DESCRIPTION .
• Speed Control Switches  - A speed control switch pod containing six momentary switch push buttons is located in the right horizontal spoke of the steering wheel. Refer to SWITCH, SPEED CONTROL, DESCRIPTION .
• Steering Column Control Module  - A Steering Column Control Module (SCCM) microcontroller is integral to the SCCM located at the top of the steering column just below the steering wheel. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), DESCRIPTION .
• Wheel Speed Sensors  - A wheel speed sensor is located on the knuckle of each front and rear wheel. Refer to SENSOR, WHEEL SPEED, FRONT, DESCRIPTION .

Hard wired circuitry connects the adaptive electronic speed control system components to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the speed control system components through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.