Storing memory positions, function

P91.29-2242-09

1 Accept or issue adjustments in accordance with memory button

2 Relevant door up

3 Terminal 15R ON

N10/3 Control module with SAM fuse and relay module,
rear 1

N32/1 Left front seat control module

N32/2 Right front seat control module

N32/11 Left rear seat control module

N32/13 Right rear seat control module

N69/1 Left front door control module

N69/2 Right front door control module

N69/3 Left rear door control module

N69/4 Right rear door control module

N73 EIS control module

S17/3 Left front door contact switch

S17/4 Right front door contact switch

S17/5 Left rear door contact switch

S17/6 Right rear door contact switch

S55/1 Left rear seat adjustment switch group

S55/2 Right rear seat adjustment switch group

S91/2 Left front seat adjustment switch group

S92/2 Right front seat adjustment switch group

Memory feature

The following adjustments can be set on the driver's side using the memory feature:

 Seat

 Steering column

 Outside mirror

 Inside rearview mirror

 Multicontour backrest

The following adjustments can be set on the passenger side using the memory feature:

 Seat

 Multicontour backrest

The following adjustments can be made in the rear compartment using the memory feature:

 Seat

 Multicontour backrest

Driver and passenger side

On the driver and passenger side up to five positions can be stored. Accordingly the seat adjustment switch has five position buttons as well as a memory button for initiating the saving process.

- W version

In the rear compartment up to five positions can also be stored.

- V version

In the rear compartment up to three positions, one permanent seat and reclining position can be stored.

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Position storage

The positions on the driver's side are stored with key codes. For this, the EIS [EZS] control module transmits the memory block number corresponding to the key code to all participating control modules. The corresponding key-dependent position is stored or entered through the combination of data from the door control module and electronic ignition switch.

If the memory block number alters during adjustment, then the attendant position has to be set.

Memory block number from electronic ignition switch

1 2 3

Position key 1 POS POS POS

From 2 POS POS POS

Door control module 3 POS POS POS

If the "memory block number" signal is not available or is implausible, then storage or adjustment is not performed.

Key dependency can be switched on or off in the instrument cluster.

Storing positions

The position keys and memory button are read in by the door control module.

There are two key actuation options available for the storing of positions:

a) First of all the memory button is held down and then the corresponding position key is pressed.

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b) Then the memory button is pressed and then released again. In response to this the corresponding position key is pressed and actuated after releasing the memory button.

If releasing the button is recognized then the attendant message is transmitted again, whereby the corresponding bit is reset. If while the switch is being pressed the function conditions are reset, then the attendant message is also transmitted again, whereby all bits are reset. A started storage process is completed.

If the CAN signal sent by the driver side door control module is received, then the following is stored:

 the current seat position by the driver side seat control module

 the current steering column position by the driver side seat control module

 the current mirror position by the door control module and the overhead control panel

 the current contour by the driver side MMKL control module

This is stored in the specified memory area for the position (1 - 3) and memory block (1 - 3) in a non-volatile memory (EEPROM).

If the CAN signal sent by the front passenger side front door control module or rear door control module is received, then the corresponding

 Seat control module stores the current seat position

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 The current contour is stored by the MMKL control module

in the specified memory area for the position (1 - 3) or (1 - 4) in a non-volatile memory (EEPROM).

Set stored positions

The position keys are read in by the respective door control module. If the CAN signal sent by the driver side door control module is received, then the following is set:

 the seat position by the driver side seat control module

 the steering column position by the driver side seat control module

 the mirror position by the door control modules, overhead control panel

 the contour by the driver side MMKL control module

These are set in accordance with the setting stored in the current memory block (1 - 3) and the actuated position key (1 - 3).

If the CAN signal sent by the front passenger side front door control module or rear door control module is received, then the corresponding

 seat control module sets the current seat position

 and the current contour is set by the MMKL control module

which is stored for the actuated position key (1 - 3) or (1 - 4). The corresponding servo motors are actuated for the seat, steering column and mirrors, for as long as the bit is set for the position to be set or the position to be entered has been reached. If this message is received with a reset bit then the adjustment is immediately stopped. If a position has not been stored then an adjustment is not made.

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Function conditions

It is possible to store positions and set stored positions when the following conditions have been fulfilled. These function conditions are verified by the transmitter of the request. Each recipient of the request checks the memory block number only.

Driver side

 Valid memory block no. and

 Terminal 15 ON or

 each respective door open

Passenger side

 Terminal 15 ON or

 each respective door open

Rear

 Terminal 15 "ON" or

 each respective door open

Priorities

If the following are actuated again:

 seat adjustment switch

 mirror adjustment switch (mirror lens adjustment, applies to driver side only)

 steering column adjustment switch (applies to driver side only)

 of an additional position key, then a transmission to store a position or set a stored position sent via the bus is stopped.

The message is sent again with reset bits. If the memory button is held down while a position key is pressed then it is ignored. Requests for manual seat, steering column and mirror adjustment take precedence over requests to store positions. The adjustment request is performed; the request to store positions is rejected.

Requests for manual seat, steering column and mirror adjustment take precedence over requests to set stored positions.

The adjustment request is performed; the request to set stored positions is rejected. Requests for the storage of positions take precedence over request to set stored positions. The current position is stored; the request to set a stored position is rejected.