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:
- Hold the desired memory button depressed until the seat stops. The button must be depressed the entire time for the seat to move. The seat will stop 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 is equipped with door mirrors with memory function. When the desired memory button is pressed, the programmed door mirror position is set. In order to do so, the power seat module (PSM) (3/26) sends information to the passenger door module (PDM) (3/127) and the driver door module (DDM) (3/126) to adjust the door mirrors to the programmed position. The door mirror memory position is stored in the driver door module (DDM) or passenger door module (PDM). The stored door mirror position is the position that door mirrors were in when the seat position was programmed. The position of the driver's door mirror is stored in the driver door module (DDM) and the position of the passenger door mirror 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:
- after the door has been opened
- within 30 minutes of the door being closed if the vehicle is unlocked
- when the ignition switch is in position 0 or the remote key is removed
- with the ignition on.

Remote operation of seats




The power seat module (PSM) has three memories to store the seat position of maximum three remote keys. There are also three memory positions that 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 key (a maximum of three remote keys, i.e. remote memory positions 1, 2 and 3).
You can choose whether the remote key memory for the seat and door mirrors is to be active via menu option "Ignition key memory/Seat & mirror position" in the Infotainment Control Module (ICM) (3/281). If you activate or deactivate the remote key memory, the new setting does not take effect until the ignition has been switched off or on again. This performed is made per remote key.
The signal from the remote key is sent from the remote receiver module (RRC) (4/119) to the central electronic module (CEM) (4/56) when the vehicle is locked or unlocked. For vehicles with the keyless system, the signal from the remote keyless entry module (RKE) (4/119) via the keyless vehicle module (KVM) (4/93) to the central electronic module (CEM) (4/56). In addition, the central electronic module (CEM) identifies which remote key is used, stores this information and determines which information (see below) should be sent to:
- power seat module (PSM) (3/26)
- driver door module (DDM) (3/126)
- passenger door module (PDM) (3/127).

Note! The market in Japan has Remote Keyless Entry (RKE) regardless of if the vehicle is equipped with keyless entry system or not. When the vehicle is not equipped with keyless entry system, the Remote Keyless Entry (RKE) communicates directly with Central electronic module (CEM). If the vehicle is equipped with keyless entry system, the Remote Keyless Entry (RKE) communicates via Keyless Vehicle Module (KVM).

The central electronic module (CEM) (4/56) transmits information about which remote key locked the vehicle and which remote key 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 key that unlocked the car is different from the one that locked it, the previous position is stored, the seat position for the remote key being used is retrieved and the seat is adjusted accordingly. If the vehicle is locked with another remote key 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 remote key is removed from the ignition switch
- when a new remote key is activated.
When you unlock the vehicle, the power seat module (PSM) uses information on which remote key unlocked the vehicle in order to select the correct remote memory position, that is to say the seat position last set by the driver for that remote key. When the door is opened, the seat begins to move to the programmed memory position. If the vehicle is unlocked and has been since it was last driven, the seat only moves if a different remote key is inserted in the ignition switch.
Movement can be interrupted by pressing one of the buttons on the control panel. Movement to the stored memory position can be restarted by pressing the lock button on the remote key.
The seat will only move to the stored position when the vehicle is stationary. If the driver starts off during movement, movement will cease.

Operating seats without memory




The power seat without memory does not have memory buttons for memory handling. The seat motors can only be regulated directly via the control panel. This type of seat does not have a power seat module (PSM). The seat motors are directly connected to the control panel.