Component description for intelligent radar sensor control unit - GF30.30-P-3305GV
MODEL 164.1/8, 251.0/1 as of model year 2011 with CODE 234 (Blind Spot Monitoring)
Shown on removed bumper, model 164.1
Location
The radar sensors are mounted on the left and right on the inner side of the rear bumper.
Task
The radar sensors can detect objects over the integral radar sensor system (for example vehicles which are in the blind spot). The radar sensors are ultra wideband radar sensors with the following preferences:
- Detection range s = 0.5 to 3 m, at a resolution of s = 0.04 m
- Detection angle: ∠ = 80° with angle measurement and ∠ = 140° only detection (tracking)
- Carrier frequency: f = 24.125 GHz (model 251 up to 31.5.13, model 164) or f = 25 GHz (model 251 as of 1.6.13)
- Mode of operation: short pulse process with f = 5 GHz band width (model 251 up to 31.5.13, model 164) or f = 1.4 GHz band width (model 251 as of 1.6.13)
The radar sensors work according to the Master/Slave principle. The "master" or "slave" function can be determined by means of the connector coding. The "master function" is determined for the right radar sensor. This means that the radar sensor on the left transmits its information via the engine compartment CAN (CAN-C) to the radar sensor on the right which evaluates this and transmits appropriate requests or data via the engine compartment CAN to various control units.
The radar sensor also have the following tasks:
- Reading in of sensors, pickups and signals
- Evaluation of input factors
- Output of signals
Reading in of sensors, pickups and signals
The input factors are received via the engine compartment CAN and contain the following information:
- Service brake, status
- Direction of movement of the vehicle
- Wheel speeds and wheel rotation direction
- Status information from the driver assist or driving safety system
The functions that use these signals are described in the individual function descriptions (see 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
Signals are sent over the engine compartment-CAN.
The right radar sensor transmits the following signals via the engine compartment CAN:
- Request output of an acoustic warning over the warning buzzer (A1h1)
- Request display message in the multifunction display (A1p13)
- Request to actuate left Blind Spot Assist readiness and warning indicator (M21/1e2) and right Blind Spot Assist readiness and warning indicator (M21/2e2)
The left radar sensor transmits detection data to the right radar sensor via the engine compartment CAN which uses it to generate the requests to emit a warning.
| Blind Spot Assist wiring diagram | MODEL 164 as of model year 2011 with CODE 234 (Blind Spot Monitoring) | PE54.71-P-2100-97MAA | |
| MODEL 251 as of model year 2011 with CODE 234 (Blind Spot Monitoring) | PE54.71-P-2100-97RAA |