Lumbar Support_Massage Description and Operation

Lumbar Support/Massage Description and Operation (With Seat Bolster Memory Control Module) The memory lumbar/bolster/massage system uses air bladders to adjust various aspects of the seat configuration to meet an occupant’s preference. It also allows these adjustments/types/intensities to be stored to a memory position along with the stored seat position. Some vehicles may also be equipped with dynamic mode control which gives the chassis subsystem the ability to request an automatic adjustment to the seat’s bolster support depending on vehicle driving conditions. The various seat adjustments and functionality which may be possible include: Lumbar support – forward and rearward Lumbar support – up and down Seat back side bolster – in and out Back massage – type(s) and intensity (intensities) Cushion side bolster – in and out The components of the system include: LIN based seat switch Seat adjuster memory module Bolster memory control module Seat air pump motor Air bladders Information display (If applicable) LIN Seat Switch The seat switch communicates all customer requests for seat movement or adjustment via the LIN serial data bus to the seat adjuster memory module. The seat switch may consist of the following controls: Seat adjuster switch similar to the typical discrete seat switch Massage On/Off switch, if massage is equipped 4-way lumbar switch which can be activated Up/Down/Forward/Rearward 2-way bolster switch which can be activated Up/Down Lumbar/Bolster Operation

Note

When the Ignition Off, it is normal operation for bladders to deflate. Once the lumbar/bolster feature has been activated, the seat adjuster memory module will command the seat bolster memory control module to perform the required pneumatic movements via LIN serial data messages. The seat bolster memory control module contains the electronic circuitry for executing the commanded pneumatic seat adjustments, air direction solenoids, pressure sensors for storing air bladder pressures, and an output which supplies battery power to the external seat air pump motor when any of the air bladders require inflating. Based on the LIN command from the seat adjuster memory module, the seat bolster memory control module controls the appropriate air solenoids and activates or deactivates the external air pump in order to inflate or deflate the air bladders in the correct combination. When an air bladder needs inflating its solenoid opens and the pump motor is activated pumping air into the bladder. When an air bladder needs deflating its solenoid opens the release valve and air is allowed to bleed out of the bladder into the vehicle cabin. To support memory recall and massage, the seat bolster memory control module uses internal air pressure sensors to track, store and recall the positions of all the air bladders under its control. The massage On/Off switch on the LIN seat switch allows the customer to turn the massage feature on and off.