Component Description For Intelligent Radar Sensor Control Unit - GF30.30-P-3305GR
MODEL 166 up to model year 2016 with CODE 234 (Blind Spot Monitoring)
Shown on a disassembled bumper (internal view)
Location
The left rear radar sensor is mounted on the left inner side of the rear bumper, while the right rear radar sensor is mounted on the right inner side of the rear bumper.
Task
The rear bumper radar sensors detect vehicles in the blind spot over the integrated vehicles radar sensor system.
The rear bumper radar sensors are ultra wideband radar sensor with the following properties:
- Detection range s = 0.18 to 30 m, at a resolution of s = 0.04 m
- Detection angle: ∠ = 60° with angle measurement and ∠ = 130° only detection (tracking)
- Carrier frequency of radar sensors:
- f = 24.125 GHz (model 166.0 up to 30.11.2012 or model 166.8 up to 30.06.2013)
- f = 25 GHz (model 166.0 as of 01.12.2012 or model 166.8 as of 01.07.2013)
- Mode of operation:
- Short pulse method with f = 5 GHz bandwidth (model 166.0 up to 30.11.2012, model 166.8 up to 30.06.2013)
- Short pulse method with f = 1.4 GHz bandwidth (model 166.0 as of 01.12.2012, model 166.8 as of 01.07.2013)
The rear bumper radar sensors operate according to the "master-slave" principle. The master or slave function can be determined via the connector coding. The master function is defined for the right rear bumper radar sensor. That means that the left rear bumper radar sensor sends its requests to output warning and readiness messages via chassis CAN 1 (CAN-E1) to the right rear bumper radar sensor, which then evaluates the information from both rear bumper radar sensors and forwards corresponding requests via chassis CAN 1 to the relevant control units. Coding (differentiation) of the rear bumper radar sensors is performed by means of different assignment with circuit 31 to pin 5 or 6.
The rear bumper radar sensors also fulfill the following tasks:
- Reading in of sensors and signals
- Evaluation of input factors
- Output of signals
Reading in of sensors and signals
The following input factors are read in over the chassis CAN 1 and contain the following information:
- Status of circuit 15
- Status of combination switch (S4)
- Status of function "Blind Spot Assist" (from the IC (A1)
- Position data for navigation (for the Western European version) (model 166.0 up to 30.11.2012, model 166.8 up to 30.06.2013)
- Status of gear range
- The signal engine running or drivetrain operational.
- Wheel speeds and wheel rotation direction
- Status of trailer recognition (with CODE 550 (Trailer hitch))
The functions that use these signals are described in the individual function descriptions (see appropriate block diagram or function schematic).
Evaluation of input factors
The input factors are evaluated by the integrated microprocessors and the relevant components are then actuated.
Output of signals
Output of signals takes place over the chassis CAN 1.
The right rear bumper radar sensor transmits the following signals via the chassis CAN 1:
- 'Warning buzzer' request (A1h1)
- Request for the multifunction display (A1p13)
- Request to left Blind Spot Assist readiness and warning indicator (M21/1e2) and right Blind Spot Assist readiness and warning indicator (M21/2e2)
The left rear bumper radar sensor sends detection data via chassis CAN 1 to the right rear bumper radar sensor, which uses it to generate the requests to output a warning.
| Blind Spot Assist wiring diagram | PE54.71-P-2100-97NAA |