Electric steering control unit, component description

N68 Steering assist control unit

Location

The steering assist control unit is located on the left at the top of the vehicle firewall.

Task

The power steering control unit takes over control of the power steering motor (M19).

The following signals are read in for this:

Via Controller Area Network (data bus/CAN bus) (CAN):

 Vehicle speed from ESP control unit (N47-5)

 Steering angle and steering speed from steering angle sensor (N49)

Direct signals:

 Steering torque from power steering torque sensor (B23)

 Resetting request from power steering motor

P46.35-2025-03

By means of the input signals the steering assist control unit determines the direction of rotation and current intensity of the power steering motor (M19) and permanently checks all input signals for plausibility.

In the event of a faulty signal the electric steering is switched off, the respective fault is stored in the internal fault memory and the electric steering indicator lamp in the (A1e18) instrument cluster (A1) is actuated.