Function

Function

Programming and operating the seats using the memory





Programming
There are four buttons for programming seat positions:
- three memory buttons called 1, 2 and 3
- a programming button, MEM.

To program in a new seat position:
- move the seat to the desired position
- press MEM and one of the memory buttons at the same time.

Moving
To move the seat to the programmed position:
- press the desired memory button and hold it in until the seat stops.
The button must be kept depressed for the seat to move. The seat stops if the button is released.
The seat stops moving when the position of the seat matches the position programmed into the memory. If another button is pressed the seat will stop moving. The seat will not move if no position is programmed.
The vehicle has door mirrors with memory. When the desired memory button is pressed, the mirrors are set to the programmed position. Information is sent from the power seat module, left (PSL) (3/26) to the power seat module, right (PSR) (3/27) and driver door module (DDM) (3/127) to set the door mirrors to the programmed position. The memory positions of the door mirrors are stored in the driver's door module (DDM) (3/126) and passenger door module (PDM). The door mirror position stored is the position of the mirrors when the seat position was programmed. The position of the door mirror on the driver's side is stored in the driver door module (DDM). The position of the door mirror on the passenger side is stored in the passenger door module (PDM).
When the seat is run, a maximum of two motors are activated at the same time. If all motors need to operate to reach the programmed position, there is an order of priority. Motor 1 (front-rear adjustment) and motor 2 (backrest adjustment) operate first.
Each seat motor has a Hall sensor which detects the present position of the seat. When one of the stepper motors for the seat is run, the control module counts the number of pulses from the Hall sensor. The Hall sensor counts the number of revolutions made by the motor by detecting a magnet on the motor shaft. This creates a pulse for each revolution of the motor.
When a seat position is stored, the information about the number of pulses counted from each motor is stored in a memory.
When one of the memory buttons is pressed in, the control module calculates which motors need to be run and in which direction to obtain the desired position.

Operating seats with memory




On a power seat, the backrest can be adjusted, the seat height can be altered and the seat can be moved forwards or backwards. There are four motors for moving the seat. The control buttons are on the outside of the seat and are in the shape of a small seat and a small backrest. There are two control buttons on each control panel. The buttons are spring-loaded, so they must be held pressed in for the seat to move.

The seat can be operated:
- within 5 minutes of the door being opened
- within 30 seconds of the door being closed
- when the key is in position 0 or removed
- with the ignition on.

Remote operation of seats




In power seat module, left (PSL) (3/26) and power seat module, right (PSR) (3/27) there are three memories, which store the seat positions for a maximum of 3 remote controls. There are also three further memory positions which can be stored from the control panel. The control module can store a total of six different memory positions.
Vehicles with power seats with memory have a personal setting function. Using this function, the positions of the door mirrors and seat can be stored individually for each remote control (a maximum of three remote controls, i.e. remote memory positions 1, 2 and 3).
The customer parameters in the power seat module, left (PSL) and power seat module, right (PSR) determine whether the remote memory for the seat is activated or not.
The remote control memory for the door mirrors can also be switched off. This is done using a customer parameter in the driver door module (DDM) (3/126) and passenger door module (PDM) (3/127). "Programming of the remote control settings" for seats and mirrors is carried out via VIDA vehicle communication.
The signal from the remote control is transmitted to the central electronic module (CEM) (4/56) when the car is locked or unlocked. The central electronic module (CEM) also identifies which remote control is being used, stores this information and decides what information (see below) must be sent to:
- the power seat module, left (PSL) and power seat module, right (PSR)
- driver door module (DDM)
- passenger door module (PDM).
The central electronic module (CEM) transmits information about which remote control locked the vehicle and which remote control unlocked the vehicle. This information is transmitted when the door is opened.
The seat position is first stored when the door is opened after unlocking. If the remote control that unlocked the car is different from the one that locked it, the previous position is stored and the seat position for the remote control being used is retrieved and the seat adjusted accordingly. If the vehicle is locked with another remote control than that used to unlock it, no memory position is stored the next time the car is unlocked.
The remote memory positions for the door mirrors are stored for the driver door module (DDM) and passenger door module (PDM) in the following cases:
- when the key is removed from the ignition switch
- when a new remote control is activated.
When the vehicle is unlocked, the power seat module, left (PSL) and power seat module, right (PSR) uses the information about which remote control unlocked the car. This is so that the correct remote memory position can be selected (i.e. the seat position last set by the driver for this remote control). When the door is opened the seat starts to move to the programmed remote memory position. The seat can be stopped by pressing one of the buttons on the control panel.
If the vehicle is opened with a key, the memory settings for the seat are not affected. Remote operation of the seat is not possible if the key is in the ignition switch.
In addition, when a door is open, it takes approximately 5 minutes before the power seat module, left (PSL) and power seat module, right (PSR) switch to sleep mode. If this occurs, and the customer then attempts to set a new seat position, the information about which remote control opened the door will have been lost and a new memory position will not be stored.

Operating seats without memory




Power seats without memory do not have memory management buttons. The seat motors can only be operated directly via the control panel. This type of seat does not have a power seat module, left (PSL) or a power seat module, right (PSR). The seat motors are directly connected to the control panel. For further information, see the Wiring Diagram manual.

"Easy-entry"




The "easy-entry" function facilitates passenger entry to the vehicle's rear seats. This is operated using a switch that is located on the upper side's outer edge of the front seats. When using this function the motors are activated that control the movement of the seats, front-rear and up/down. The seat is then moved forwards and downwards to facilitate entry to the rear seats.

Warning! There must not be anybody sitting in the seat when easy-entry is operated.