C. Version With Memory Control/Steering Column Adjustment 06/90

Version with memory control and steering column adjustment 06/90

Operation






The steering column is adjusted by the steering column adjustment switch (S59) on the column casing tube.
The seats and head restraints are adjusted by the switches S22 and S23 in the door linings.


The adjustment can be made when the key is in position 1 and 2 or when it is withdrawn, and the driver's door is open.

Two steering column, seat and the relevant head restraint positions can be stored and retrieved as required.

Seat and head restraint adjustment switch






S22 Front left seat adjustment switch
S22s1 Head restraint high/low
S22s2 Seat height front
S22s3 Seat forward/back
522s4 Seat height rear
S22s5 Backrest
S22s6 Position button 1
S22s7 Position button 2
S22s8 Memory button






The wiring harness is connected to the switch by four plug connectors.


Storing seat and head restraint position








1. Adjust position of the seat and head restraint.
2. Press memory button (52258).
3. Press position button (S22s6 or 522s7).

The position button must be pressed within 3 seconds after the memory button (S22s8) otherwise the position is not stored.

Front left seat adjustment switch

S22s1 Head restraint high/low
S22s2 Seat height front
S22s3 Seat forward/back
S22s4 Seat height rear
S22s5 Backrest
S22s6 Position button 1
S22s7 Position button 2
S22s8 Memory button

Retrieving stored position (seat and head restraint)

Press position button (S22s6) or (S22s7). For safety reasons, the position button must remain pressed until the end position is reached and all the motors have stopped operating. If several buttons are pressed simultaneously, the adjustment operation is interrupted. A stored position can then only be reached after again pressing a position button.

Electronic control unit







M7m2 Seat height front
M7m3 Seat forward/back
M7m4 Seat height rear
N32/1 Front left seat adjustment control unit with memory

The front left power seat control unit with memory (N32/1) is positioned below the seat.

Seat adjustment device

The seat is adjusted by a gear (18), which is driven by 3 motors (M7m2, M7m3, M7m4) through 3 shafts (19). These parts are located below the seat.

Each motor is assigned a potentiometer (10a, 11a, 12a) as a position sensor for storing the position. Depending on the seat position a certain resistance flows through the potentiometers to the front left electronic seat adjustment control unit with memory (N3211) and is stored there.

If a potentiometer is faulty, e.g. at the forward/back seat adjustment motor, the forward/back adjustment is then no longer stored. This does not affect seat adjustment.

The motors, shafts, potentiometers and the gear of the power seat adjustment can be replaced individually.







The backrest is adjusted by an additional motor (M7m5) which is fitted to the frame of the backrest and which moves the backrest forward and back by driving a gear.
A potentiometer is integrated in the motor (M7m5) as a position sensor.

- M7m5 Backrest







The motor (M7m1) for adjusting the head restraint is installed in the frame of the backrest.
The head restraint is adjusted by a rack (20) which is driven by a motor through a shaft (21). A replaceable potentiometer (14a) is installed at the motor as a position sensor.

- M7m1 Head restraint high/low

Steering column adjustment device






The steering column is adjusted by a gear which is driven by a motor. These parts are attached to the steering column.

M20 Steering column adjustment motor group
1 Feed
2 control connection/memory