Component description for radar sensors control unit - GF30.30-P-3301LEC

ENGINES 156, 272, 273, 275, 629, 642 in MODEL 221 up to 31.8.10 with CODE (239) Autonomous intelligent cruise control Plus Light as of model tear 2010/YoM 09 model refinement package 

Shown on right trunk 

Fig 1: Locating Radar Sensors Control Unit

Courtesy of MERCEDES-BENZ USA

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
• Permanent Speed Limiter
• Plus Light adaptive cruise control
• Distance warning system
• BAS PLUS (Brake Assist System PLUS)

The radar sensors control unit is the evaluation unit for the radar. For this purpose the DTR control unit (A89) (radar) is interlinked with the radar sensors control unit via the vehicle dynamics CAN (CAN H).

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 

Direct input signals 

• Circuit 30
• Circuit 31

Direct output signals 

• None

CAN input signals from the chassis CAN 

• Status of the accelerator pedal
• Drive position status
• Parking brake status
• Status of steering angle
• Driver request via CC [TPM] push button (S40/4)
• Driver request via menu settings in instrument cluster (A1)

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 for 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 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

Design 

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

radar sensors control unit wiring diagram

N62/1

PE30.30-P-2102-97SAC