technical specifications ACC sensor

The ACC control module is installed at the front of the vehicle under the bumper. Only one type of control module is used which can be coded to specific variants. It is not possible for the workshop to conduct repairs on the control module.
The radar sensor contains a transmitter and a receiver. The signal is emitted via an antenna that also serves to receive the reflected signals. The radar beam has the shape of 3 cones. One of the cones points in the direction of travel, the other two are offset horizontally by 2.5 degrees.

Transmission frequency: 76 -77 GHz (wavelength approx. 4 mm)
Mean transmission power: 1 mWatt
Detection range (Distance): 2 m -170 m (120 m is used)
Detection range (Relative speed): 60 m/s
Detection range (Horizontal): +/- 4 degrees
Detection range (Vertical): +/- 2 degrees
The ACC control module is protected against short circuits, positive or ground supply, polarity reversal and open circuits. The responses of the radar sensor at undervoltage and overvoltage are listed in the following:
· UB < 6.5 V: Under-voltage cutout of radar sensor with fault code entry
· UB > 10.6 V: Reactivation of radar sensor
· UB > 24 V: Overvoltage cutout of radar sensor with fault code entry
· UB < 17.2 V: Reactivation of radar sensor

The ACC is a complex system network with distributed functions in various partner control modules. The partner control modules are connected via the data bused with the ACC sensor. Important partner control modules are:
Motor control: Moment interface
ABS/DSC (driving dynamics control): Drive status, Vehicle deceleration Brake light
Instrument Cluster: ACC indicators
Transmission Control: Gear information, Gearshift characteristic map
Light switching center: Brake light
Car Access System: Terminal status
Trailer Module: Trailer status
Parking brake: Status, parking brake.
 

is one of the best Professional scan tools to for BMW; Autohex allows you to diagnose, code, program/flash ecus, and add new keys for BMW. For more information: BMW Scan Tool