All sensors are included in the Premier including the LED for the ACC idiot light. But that doesn't mean that the dealer can install a software set to add the ACC option. Software installation and changes are controlled by the VIN stored in the ECU.
Windshield camera is coupled to object recognition software used for lane detection, vehicle ahead identification, the dash idiot lights, intellibeams, electric steering and tranny output sensor used for speed detection. The front grille camera is only used for a front when traveling forward under 5mph and the 360 surround view in the DIC. Radar sensor is used to determine following distance for the ACC, but also for feedback in conjunction with the low speed braking, pedestrian detection and to trigger heads up warning LEDs in the Premier, and other models equipped with the optional detection packages.
Indication that the front windshield camera is not used for low speed braking and pedestrian detection is because these function remain operative under adverse visual road conditions such as a heavy rain downpour, blizzard or fog, whereas under these conditions lane detection is inoperative and sometimes automatically turned off with a DIC warning under these same conditions (with a vehicle stop and restart once road conditions are cleared to reactivate using the console button - happened on once during a really heavy rain)
Current Chevys -'19 Silverado RST;'18 Malibu LT Redline;'18 Traverse Premier Redline<br /><br />Previous Chevys:16 Silverado LT;16 Malibu LT2;'17 Impala;'16 MalibuLT;'15 Camaro LS;'15 Traverse; '13,'12 and '07 Avalanche LTs; '11 Tahoe LT; '13 &'11 Malibu LTs; '08 Trailblazer;'06 Colorado WT..... Chrysler era.....'80 Citation;'75 Impala;'72 Chevelle;'69 Camaro R/T;'65 Impala SS;'62 Nova