Bosch DSC 3.X User Manual download pdf (Page 22)

E46 Dynamic Stability Control Systems

Steering Angle Sensor (LEW)

The Steering Angle Sensor is mounted towards the lower end of the steering column,

above the flexible coupling. The LEW consists of a potentiometer and a built in

microprocessor. The potentiometer has two pickups offset at 90

to one another. The raw

potentiometer signal is processed and converted into a digital signal that is transmitted over

the CAN bus to the DSC control unit.

The sensor requires initialization in-order to create a zero point default. Once initialized, the

LEW sends an ID number to the DSC control unit. The ID provides confirmation that the

LEW is properly initialized.

The total steering wheel angle is determined by combining the CAN telegram signal, the

stored zero point default and the actual number of turns to the wheel. In order to prevent

the LEW from loosing count, KL 30 is provided to the sensor and it continues to record

even after the ignition has been switched off.

The DSC calculates the drivers desired rate of turn from the steering angle signal.

Pin 1. KL 30

Pin 2. KL 87

Pin 3. CAN high

Pin 4. CAN low

Pin 5. KL 31

Pin 6. TXD

Note: Refer to the Workshop Hints for instructions on coding and initializing the sensor.

High signal

360

270

180

270

360

POTENTIOMETER

HOUSING

CAN BUS MICROPROCESSOR

CAN BUS CONNECTOR

(5 WIRES)

Potentiometer 1

Potentiometer 2

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 46 47

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Bosch DSC 3.X User Manual Page 22