Seat Memory
Seat Memory
The seat memory offers the opportunity of storing up to 3 different positions (2 memory presets and "last position used") for every Remote Control used.
This means that if 4 Remote Controls have been assigned to the vehicle, up to 12 different positions can be stored in the individual seat module.
Availability of these 12 positions depends on whether Key Memory is set to "active" or "not active". With Key Memory set to "not active", only 3 memory positions are available. They are assigned to the vehicle irrelevant of the Remote Control being used.
With Key Memory set to "active", memory presets stored are assigned to the Remote Control that is currently being identified (memory preset 1 and 2 and the "last position used"). The number of stored positions then becomes 3 X the number of remote controls assigned up to a maximum of 4 (12 positions).
The following components are required for the seat-memory function:
- Memory buttons, driver's and passenger's
- Center Console Control Center (BZM)
- Car Access System (CAS)
- Seat module, driver and passenger (SMFA/SMBF)
- Seat-adjusting motors with a Hall sensor
The SMFA/SMBF requires information from the CAS in order to execute the stored seat positions: Remote Control number and memory buttons (from the BZM).
- The information is sent from the CAS via the K-CAN P to the seat module.
- The seat-adjusting motors are then activated accordingly.
When using the Remote Control to unlock the vehicle, the seat automatically moves to the last position used for that Remote Control.
If an unlocked car is entered and no button of the Remote Control is pressed, the seat moves to the last position stored once the Remote control is identified by the CAS.
At the same time, the CAS sends the same information to:
- The front door modules for the mirror-memory position
- The CIM (Chassis Integration Module) for the steering column memory positions.
Memory Preset buttons
The memory buttons are integrated in the memory/auxiliary function switch block (behind the adjusting-switch block) and consist of:
- Pad with 3 buttons (position buttons 1 and 2 and a memory storage button)
- Indicator LED in memory storage button for memory readiness
Depending on the special equipment fitted, the buttons for the following functions can be integrated in the switch block:
- Seat heating
- Seat ventilation
- Active seat
The status of the memory button is communicated to the relevant seat module over the bus system.
Signal path: Button ribbon cable BZM K-CAN-S CAS K-CAN-P SMFA or SMBF.
The position of the lumbar support cannot be stored.
Programming
Programming of seat positions is only possible from terminal R "on".
The following operating steps must be performed in order to store a seat position:
- Press memory button "M": The memory button lights up to acknowledge programming readiness.
- Press position button: adoption of current position of seat, steering column and side mirrors.
- Programming readiness is deactivated if no position button is pressed within 7 seconds while it is activated. The function indicator is deactivated.
- Programming readiness is also deactivated when the memory button is pressed again.
- If no personalization key is recognized, the programming function is not available when the key memory is activated.
Calliing Up Memory Positions
There are 2 operating modes for calling up stored positions on the driver's seat:
- One touch mode: touching the desired position button moves the seat automatically up to the end setting of the stored positions. The one-touch function is only possible with terminal 15 "off" to eliminate any safety hazard caused by accidental touching of the button.
- Continuous hold mode: the seat moves only as long as the desired position button is continuously pressed. The motors are shut down immediately if the button is released before the target position is reached. Pressing the position button again resumes the positioning up to the end setting of the stored position (target position).