Entrance Aid (Convertible)

Operation

Manual adjustment of drives
The adjustment switches in the switch block are used for adjusting the seat manually. The adjustment switches are located on the sides of the seats facing the door.

The following drives can be operated with these switches:
- Fore/aft drive
- Seat height drive
- Seat inclination drive
- Backrest angle adjustment drive
- Head restraint drive

Programming a memory position
- The ignition lock must be in position 1 or 2.
- Press memory button on memory switch. Programming readiness is indicated by the memory button lighting up.
- Press one of the 3 position buttons to store the current seat position.
- The indicator lamp goes out after the position button has been pressed.
- Program readiness is cancelled if no position button is pressed within 7 s. The position button goes out.

Retrieval of a memory position
A differentiation is made between two operating modes when stored seat positions are retrieved:
- Single-strike mode:
In single-strike mode, it is enough to briefly press one of the 3 position buttons to start the positioning procedure. Positioning runs automatically until the target position is reached.

Single strike mode is effective when the driver's door is opened and the ignition lock is in position 0 or 1.

The ignition lock must be in position 1 when the driver's door is closed.

- Press-and-hold mode:
In order to call up a seat position, the corresponding position button must be pressed and held to maintain the positioning procedure. If the button is released before the target position is reached, the corresponding drive is switched off immediately. The positioning procedure is continued when the position button is pressed again. If another position button is pressed, the positioning procedure for the new position is started.

Press-and-hold mode is effective when the driver's door is opened and the ignition lock is in position 2.

And with the ignition lock in position 0 or 2 with the driver's door closed.

Easy Entry
To facilitate entry in the front area, with the aid of an additional switch (Easy Entry) on the top of the backrest, the easy entry facility (cabriolet only) initiates adjustment of the seat slide in longitudinal direction. For this purpose the seat forward/backward adjustment drive is activated in the second speed stage. The front most position of the seat is identical to that in the electrical adjustment range. The return position is the position the seat was in before activation or the rear most position

The return position is always stored when the seat forward/backward adjustment switch is released or automatic adjustment is triggered via the position buttons. The seat position cannot be stored with the easy entry switch.

The easy entry switch has the same status as the seat adjustment switches and can therefore interrupt motor operation at any time.

Triggering of the easy entry facility is controlled by means of two additional signals that are generated via the easy entry switch. Adjustment, however, is only possible under the following vehicle conditions:
- Door open
- Vehicle stationary

The door contact and speedometer A signals required for this purpose are transmitted via the K-bus.

The head restraint moves down when operating the backrest lock lever. This operation is triggered by means of a backrest lock contact fitted in the seat.

Front Passenger's Seat Coding
To ensure the K-bus can differentiate between the driver's and front passenger's seat memory control module (easy entry), the front passenger coding input is applied to ground or left open via the seat wiring harness.
- Pin 13 input connected to ground - front passenger's seat control module
- Pin 13 input open - driver's seat control module

Detection of end stops
Automatic detection of the adjustment range limits is provided to avoid unnecessary load on the drives.

Should a block be detected several times in the same position, the detected position value is interpreted as the end stop. Any further adjustment is terminated before this limit is reached.

An incorrectly detected limit stop (e.g. due to the seat blocking on objects) can be reset, after the obstruction is removed, by pressing the manual adjustment switch once more.

Components
- Switch block
- Control module
- Easy entry switch
- Backrest lock contact
- Head restraint actuator
- Backrest angle actuator
- Height adjustment actuator
- Forward/backward adjustment actuator with two speed stages
1st stage (slow) for normal seat adjustment
2nd stage (fast) for easy entry

Hall sensors are fitted on all actuators for the purpose of detecting the position.