Electric steering-assist motor
Adds controlled force to help turn the wheels.
On the steering rack or column according to design.
The steering controller commands motor torque using driver and vehicle inputs.
An electric helper pushing with your steering effort.
Heavy steering or assistance warnings can involve voltage, sensors, control or the motor.
Joints and boots are inspected for play, damage and leakage; electrical assistance has no universal preventive replacement interval.
A tie-rod or boot service differs from a complete assisted rack. Alignment and electronic calibration may add work.
Electric steering assistance does not mean a BMW has no mechanical connection to the front wheels.
BMW steering systems as fitted; assistance type and rear-steering availability depend on chassis.