N68 | Electrical power steering control unit |
P46.35-2108-06
Location
The electrical power steering control unit (N68) is mounted to the rack-and-pinion steering's steering gear.
Task
The electrical power steering control unit has the following tasks:
Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Transmission of requests/information
Reading in of sensors and signals
The input factors are read in over the following connections:
Direct line
Interior CAN (CAN B)
Chassis CAN (CAN E)
Direct line
The following sensor is read in via a direct line:
Electric power steering torque sensor (A91b1)
Interior CAN
The following signals are read in via interior CAN:
Steer Assist request, wheel speeds and steering wheel angle as well as steering angle rate of change from Electronic Stability Program control unit (N30/4)
"Drive train operational", "Engine running" and engine rpm from ME-SFI control unit (N3/10) (except 453.091/391/491)
"Drive train operational" from electric vehicle control unit (N127) (only model 453.091/391/491)
Evaluation of input factors
The input factors which are read in are evaluated by the integrated microprocessor, the relevant components are then actuated and requests/information are output.
Actuation of components
The following component is actuated directly:
Electric power steering actuator motor (A91m1)
Transmission of requests/information
The following requests/information are sent over the interior CAN:
Request to actuate power steering warning lamp (A1e70) to instrument cluster (A1) (except model 453.091/391/491 with code K36 (Instrument cluster with 8.9 cm (3.5") color display))
Request for a warning message to instrument cluster (vehicles with code K36 (Instrument cluster with 8.9-cm (3.5") color display))
Diagnosis information to the diagnostic connector (X11/4)