Lumbar Support

Lumbar Support

Both seat versions are available with pneumatic lumbar adjustment as standard equipment.







The following components are required for the lumbar support function:

- Switch block, auxiliary functions, driver and passenger
- BZM
- Car Access System (CAS)
- Seat module, driver and passenger (SMFA/SMBF)
- 2 inflatable air chambers (bladders)and 2 solenoids per seat
- 1 air pump per seat

Operation

Lumbar adjustment is performed by 2 inflatable chambers (air bladders) in the backrest. The air chambers are inflated and deflated by 2 solenoid valves. The air pump delivers the required air pressure.

The air pump and the actuators are activated by the seat module based on the commands from the seat switch block.

The signals for operating the lumbar support are transmitted over the buses

Signal path: Switch block 12-pin ribbon cable BZM K-CAN S CAS K-CAN P SMFA or SMBF.