GF30.30-P-3301LE Component Description For Radar Sensors Control Unit

GF30.30-P-3301LE Component Description For Radar Sensors Control Unit
- with CODE (233) Distronic Plus
- as of model year 09

Component Identification:

Location
The radar sensors control unit is located at the bottom right side of the luggage compartment.

Task
The tasks of the radar sensors control unit include controlling the following functions:
^ Variable Speed Limiter(except code (494) USA version)
^ Permanent Speed Limiter
^ Automatic deactivation of the radar sensor system (for the Western European version)
^ DISTRONIC PLUS
^ Distance warning system
^ BAS PLUS (Brake Assist System PLUS)
^ PRE-SAFE brake
^ Park Assist (except model 221 as of AEJ 09 model refinement package)
^ Parking Guidance (except model 221 as of AEJ 09 model refinement package)
^ Blind Spot Assist (for code (234) Blind Spot Assist)

The additional tasks of the radar sensors control unit are:
^ Actuation and evaluation of front short range sensor
^ Evaluation of the long range radar

The radar sensors control unit is the unit that evaluates the short range radar sensors and the long range radar.
To do this the front and rear short range sensors, up to AEJ 09 model refinement package, are each networked via a sensor-CAN (CAN S) and from AEJ 09 model refinement package via a joint sensor CAN with the radar sensors control unit. The long range sensor is networked via the vehicle dynamics CAN (CAN H) with the radar sensors control unit.
The radar sensors control unit also receives information (such as own vehicle speed and driver acceleration requests) from other control over the chassis CAN (CAN E) and dynamics CAN.
After evaluating all sensor data and input signals, the radar sensors control unit takes full control of the vehicle longitudinal movements, by sending accelerate, decelerate, brake or gearshift signals via the chassis CAN.
The radar sensors control unit also actuates warning tones and indicators on the instrument cluster (A1).

Input and output signals
The following input signals and output signals are evaluated and sent by the radar sensors control unit.
^ Direct input signals
^ Direct output signals
^ CAN input signals from the chassis CAN
^ CAN output signals to the chassis CAN
^ CAN input signals from the dynamics CAN
^ CAN output signals to the dynamics CAN
^ CAN input signals from the sensor CAN
^ CAN output signals to the sensor CAN

Direct input signals
- Circuit 15 (up to AEJ 09 model refinement package)
- Circuit 30
- Circuit. 31

Direct output signals
- None

CAN input signals from the chassis CAN
- Accelerator pedal status
- Drive position status
- Parking brake status
- Steering angle status
- Navigation position data (for the Western Europe version)
- Driver request via the CC [TPM] push button (S40/4)
- Driver request via the menu settings in instrument cluster
- Flasher status
- Trailer status (for code (550) Trailer hitch)

CAN output signals to the chassis CAN
- Switching request
- Torque request
- Request from DTR warning lamp (A1e59)
- Request from electronic speedometer (A1p8)
- Request from multifunction display (A1p13)
- Request from left and right Blind Spot Assist warning indicator (M21/1e2, M21/2e2)
- Request from acoustic warnings

CAN input signals from the dynamics CAN
- Service brake, status
- Yaw rate status
- Own vehicle speed
- Status of Electronic Stability Program (ESP)
- Long range radar radar data
- Diagnostic data from long range radar

CAN output signals to the dynamics CAN
- Brake request
- Radar request from long range radar
- Diagnosis request from long range radar

CAN input signals from the sensor CAN
- Radar data from short range sensors
- Diagnostic data from short range sensors

CAN output signals to the sensor CAN
- Radar request from short range sensor
- Diagnosis request from short range sensors

Design
Due to the high performance of the radar sensors control unit, it is equipped with two controllers (clock frequency 40 MHz each).