Component Description

K124 Active Safety Control Module 

The K124 Active Safety Control Module analyzes data from various modules, sensors, and switches to provide enhanced safety features. In addition to providing alerts, the K124 Active Safety Control Module will provide driver assistance through integrated brake assist, automatic collision preparation, rear emergency braking, and adaptive cruise control. Inputs and outputs can either be connected directly to the K124 Active Safety Control Module or communicate though serial data. The K124 Active Safety Control Module communicates on a dedicated object detection bus, as well as the chassis expansion bus and low speed GMLAN.

Forward collision alert and lane departure warning can be user selected to either a haptic signal utilizing the driver's safety alert seat or using beeps through the infotainment system. This setting can be found in the vehicle personalization menus. See the owner's manual for more detailed information on vehicle personalization.

If there is a DTC set in any of the modules that the K124 Active Safety Control Module uses as inputs, it will send a "Service Driver Assist" message to the P16 Instrument Cluster to alert the driver of a problem with the system. No other specific details are given unless the driver attempts to activate a specific system. For example if the driver attempts to turn on lane keep assist, the P16 Instrument Cluster will display "Lane Keep Assist Unavailable" and the indictor will flash and then go out. A scan tool must be used to read the DTCs that are causing the malfunction to help find the problem. Some of the inputs to the K124 Active Safety Control Module can affect forward facing features, rear facing features, or all features. Systems to check to determine which area to focus lane keep assist and adaptive cruise control. If none of the active safety system features are operative, there may be an issue with another module on the vehicle not providing the proper data to the K124 Active Safety Control Module. If all K124 Active Safety Control Module features are inoperative, check the Adaptive Cruise Control Inhibit History and Disengage History scan tool data for the reason for the malfunction. Definitions of parameters and suggestions on what to look for can be found in K124 Active Safety Control Module: Scan Tool Information . Any item with a "Yes" was the reason why the adaptive cruise control system was inoperative at that time. In some cases verifying the module is the correct part number, has the latest version of software is necessary, and is calibrated properly.

• K124 Active Safety Control Module inputs:
  • B174W Frontview Camera - Windshield
  • B233B Radar Sensor Module - Long Range
  • B119 Multi-axis Acceleration Sensor
  • B99 Steering Wheel Angle Sensor
  • B5 Wheel Speed Sensors
  • Adaptive cruise control gap switch
  • Lane keep assist switch
• K124 Active Safety Control Module outputs:
  • K9 Body Control Module
  • K17 Electronic Brake Control Module
  • K20 Engine Control Module
  • P16 Instrument Cluster
  • P29 Head-Up Display
  • K40 Seat Memory Control Module (safety alert seat)
  • Lane keep assist switch indicator
  • Infotainment system

B174W Frontview Camera - Windshield 

The B174W Frontview Camera - Windshield is located behind the windshield, looking out at the road ahead and detects lane markings and objects directly ahead, within a distance of approximately 60 meters (197 ft). The B174W Frontview Camera - Windshield is used for lane departure warning and forward collision alert systems. The B174W Frontview Camera - Windshield communicates with the K124 Active Safety Control Module via serial data on the object detection bus.

Using information from the B174W Frontview Camera - Windshield, the K124 Active Safety Control Module will provide forward collision alert and lane keep assist to the driver when appropriate. The alerts and warnings can be user-selected to be audible through the audio system or haptic using the active safety seat.

B233B Radar Sensor Module - Long Range 

The B233B Radar Sensor Module - Long Range is located behind the front fascia and is used in the 30 - 200 m (98 - 656 ft) range. The B233B Radar Sensor Module - Long Range communicates with the K124 Active Safety Control Module via serial data on the object detection bus. In addition to the wiring harness ground, the module is grounded through the mounting bracket.

K17 Electronic Brake Control Module 

The K17 Electronic Brake Control Module performs the braking activities of the active safety system. When requested by the K124 Active Safety Control Module, the K17 Electronic Brake Control Module will prepare or apply the brakes as necessary in response to an imminent collision.