Rear Axle Steering Control Unit, Basic Function - GF46.80-P-9890A
Model all (CAR)
as of model year 2021
with code 201 (Rear axle steering)
Model all (CAR)
with code 216 (Rear axle steering with large angle)
Example illustration, rear axle steering control unit
Overview
This document contains information on:
- General
- Function
- Reading in of signals
- Evaluation of input signals
- Actuation of components
- Output of signals
General
Depending on the version of the steering on the rear axle, there is one central or two control units located on the wheel for implementing the rear axle steering function.
| Model | Rear axle steering control unit (1) | Right rear axle steering control unit (2) | Left rear axle steering control unit (3) |
|---|---|---|---|
| 290 | - | X | X |
| 206 | X | - | - |
| 223 | X | - | - |
| 297 | X | - | - |
Function
Reading in of signals
The rear axle steering control unit also receives the following input signals:
- Status of circuit 15
- Drive system status
- Vehicle speed
- Control status of rear axle steering request
- Toe angle change request
- Tie rod force for rear axle steering request
- Status of steering wheel angle sensor
- Status of roller dynamometer mode
- Snow chain mode status
- Accelerator pedal position status
- Drive position status
- Trailer hitch status
Evaluation of input signals
The received input signals are evaluated by the microprocessor integrated in the rear axle steering control unit. The corresponding component parts are actuated after evaluation of the input signals.
Actuation of components
The rear axle steering control unit actuates the integrated actuator motor directly.
Output of signals (vehicle with left and right rear axle steering control unit)
The rear axle steering control unit primarily transmits the following output signals:
- Rear axle steering actuator status
- Rear axle steering angle signal (right rear axle steering control unit)
- Left toe angle change request (right rear axle steering control unit)
- Rear axle steering display request (right rear axle steering control unit)
Output of signals (vehicle with central rear axle steering control unit)
The rear axle steering control unit primarily transmits the following output signals:
- Rear axle steering actuator status
- Rear axle steering angle status