Seat adjustment, rear seats

Depending on equipment, the following adjustments to the seats are possible:

• Seat fore/aft adjustment
  
• Seat angle adjustment
  
• Seat angle adjustment
  
• Headrest adjustment
  
• Headrest adjustment
  

Brief description of components

Seat module, driver's side rear / passenger's side rear

The seat modules are fitted at the seat.

The seat modules are linked across the K CAN SYSTEM data bus to the control units of the body area.

Rear centre console switch centre (BZMF)

The rear centre console switch centre control unit is

• the interface from the K CAN SYSTEM data bus to the control units of the body area and
  
• the interface to the seat switches.
  

The control unit rear centre console switch centre is fitted in the rear centre armrest.

Operating switch rear driver's side / passenger's side rear

Depending on the equipment, various switch blocks are fitted.

The switch blocks are connected by means of ribbon cables to the rear centre console switch centre (BZMF).

Hall sensors, seat position

With the seat memory equipment, servomotors with Hall sensors are fitted for position activation.

Main functions

Seat adjustment

The seat adjustment is triggered by pressing the corresponding switch.

• The adjustment request is transferred from the switch block across a ribbon cable to the rear centre console switch centre (BZMF).
  
• The rear centre console switch centre (BZMF) makes the message available to the Car Access System (CAS) across the K CAN SYSTEM data bus.
  
• The Car Access System (CAS) is the ”gateway control unit” it forwards the message across the K CAN PERIPHERALS data bus to the corresponding seat module.
  
• The seat module activates the adjustment motor directly via its final stages. Simultaneously, a maximum of 3 motors are activated.
  

In the case of the comfort rear seat, the headrest adjustment is a function of the seat angle adjustment after terminal R On.

If seat occupation is no longer detected or terminal R is switched off, the headrests are lowered again.

Operation of the seat memory

Programming/storage

Seat positions can only be programmed as of terminal R.

Saving a seat position:

• Press the memory key ”M”: The programming readiness is active for 7 seconds.
  Programming readiness is indicated by the Memory button lighting up.
  
• Press position button: adoption of current of seat position data.
  

Retrieval

Pressing the corresponding position button causes the drives to move into the desired position.

Child safety lock (KiSi)

If the child safety lock (KiSi) is activated, a red light emitting diode lights up in the KiSi button on the switch block of the driver's door. When the child safety lock (KiSi) is activated, the following functions are blocked:

• Electrical adjustment of the rear seats
  
• Opening and closing the windows in the rear doors
  
• Opening the rear doors