Adjust/save steering column, function

General function requirements

 C. 15R On

Adjust/save steering column, general

The longitudinal and height adjustment of the steering column permits the individual adaptation of the steering wheel position to the driver.

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The store/adjust steering column function is comprised of the following subfunctions :

 Adjust steering column function sequence

 Save position of steering column function sequence

 Call up saved steering column position function sequence

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Adjust steering column function sequence

Pressing the steering column adjustment switch (S59) requests an adjustment of the steering column. The steering column tube module (N80) reads in the status of the steering column adjustment switch and transmits the request via the interior CAN to the driver-side front seat adjustment control unit with memory (N32/1).

Depending on the request the front seat adjustment control unit actuates the steering column in/out motor (M20m1) or the steering column up/down motor (M20m2). Actuation take place for as long as the steering column adjustment switch remains pressed or until a steering column limit stop is reached.

Save position of steering column function sequence

The current position of the steering column can be saved together with the position of the driver seat and the outside mirrors.

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It is saved by pressing the memory switch 1, 2, 3 (S91/2s14) or by pressing the memory switch (S91/2s9) in the left front seat adjustment switch group (Memory) (S91/2). The corresponding positions are stored in the front seat adjustment control unit. Up to three different data records can be stored.

Storage can be effected in different ways.

- Operate and hold the memory switch, then press the corresponding memory switches 1, 2, 3.

- Operate and release memory switch for t > 100 ms, then press the corresponding memory switches 1, 2, 3 within
t  0.2 s to t  3 s.

Operation of the seat adjustment switch group is read in by the left front door control unit (N69/1) and transmitted to the front seat adjustment control unit over the interior CAN.

The front seat adjustment control unit stores the current position of the steering column motors by means of signals from the Hall sensors integrated into the motors.

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 When saving the position the instrument cluster (A1) emits an acknowledgment tone.

Call up saved steering column position function sequence

To move to a stored position the corresponding memory position switch 1, 2, 3 has to be pressed and held until the stored position is reached.

If the switch is released, the adjustment procedure is terminated immediately.

Operation of the memory switch 1, 2, 3 is read in by the left front door control unit and sent over the interior CAN to the front seat adjustment control unit, which then actuates the motors directly.