Bosch DSC 3.X User Manual download pdf (Page 13)

Steering Angle Sensor

The steering angle sensor is mounted at the bottom of the steering column near the flexi-

ble coupling.

The sensor is a new type which differs from the DSC II system. This sensor is equipped

with a processor and is directly linked to the CAN bus to communicate with the DSC mod-

ule.

The sensor also contains the EDC III steering angle sensor in the same housing but it is not

on the CAN bus and the signal output to the EDC III control unit remains unchanged.

The sensor still utilizes two potentiometers to determine the steering angle and the rate of

steering angle change. These are the raw signals the CAN bus microprocessor utilizes to

create the steering angle signal for broadcast over the CAN bus.

As with DSCII, this sensor still requires calibration after repairs to the steering or suspen-

sion system. Once the calibration is completed, the sensor now also sends as identifica-

tion number over the CAN bus to the DSC III module. The ID provides confirmation is the

DSC module that the steering angle sensor is properly calibrated.

If the ID differs due to component swapping, it will not be possible to enter the DSC sys-

tem for diagnosis. The Diagnosis Program will request that the steering angle sensor be

recalibrated using “Service Functions”. Once complete, a new ID number is generated and

the DSC module and steering angle sensor are properly mated.

The DSC III logic checks the plausibility of the steering angle sensor against other DSC III

inputs (front wheel speeds, rotation rate and lateral acceleration sensors). If the battery

voltage is interrupted, the current steering wheel rotation is recalculated by the DSC mod-

ule evaluating front wheel speeds.

Introduction to DSC

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Bosch DSC 3.X User Manual Page 13