Seat Adjustment, Rear (With SMAFH/SMBFH Seat Module)

Seat adjustment, rear seats
Depending on equipment, the following adjustments to the seats are possible:
- Seat fore/aft adjustment
- Seat angle adjustment
- Seat depth adjustment
- Seat angle adjustment
- Headrest adjustment
- Headrest adjustment

Brief description of components
Seat module, rear driver's side/rear passenger side
The seat modules are fitted in the luggage compartment.
The seat modules are networked with the vehicle via the CAN BUS.

Rear center console switch center
The control module rear center console switch center has the following functions:
- CAN BUS interface to the vehicle electrical system
- Interface to the seat switches
The control module rear center console switch center is fitted in the rear center armrest.

Operating switch rear driver's side/rear passenger side
Depending on the equipment, various switch blocks are fitted.
The switch blocks are connected by means of ribbon cables to the rear center console switch center (BZMF).

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

Main functions
Seat adjustment
The seats are adjusted by operating the corresponding switch.
- The adjustment command is transferred from the switch block to the BZMF across a ribbon cable.
- The BZMF sends the message across the K-CAN SYSTEM to the Car Access System (CAS).
- The CAS as "gateway control module" passes the message on to the corresponding seat module via the K-CAN PERIPHERALS.
- The seat module activates the adjustment motor directly via its final stages.
In the case of the comfort rear seat, the headrest adjustment is a function of the seat angle adjustment.
In the case of the special equipment rear compartment safety package, the headrests are raised automatically when the following are detected
- seat occupied
- 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
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 position of seat.
Retrieval
Pressing the desired position button causes the drives to move into the corresponding position.

Setting the passenger seat from the rear
The passenger seat can be set from the rear of the car interior:
- Press the seat "[--]" button to activate the function
- Press the seat switch within 10 seconds
If no adjustment is carried out within 10 seconds, the adjustment switches back to the rear seat.

Child safety lock
The safety switch for the power windows prevents adjustment of the rear seats at the same time.