Seat Memory System - BMW 1999-2005 M3 Service Manual

Seats
2 of 5
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Cushion height
Head restraints.

Seat memory system

In cars with seat memory, the driver's
front seat incorporates two control
modules: One in the seat adjusting
switch (arrow) and the second under
the seat cushion. The two modules
process the following:
Seat adjustments
Comfort entry aid switch (2-door
models)
Seat backrest lock microswitch
(2-door models)
Seat belt fastened
K-bus communication with the
General Module (GM V) and
instrument cluster
The driver seat module stores three
seat positions for recall. The
information is stored in non-volatile
memory, preventing loss of memory in
case of electrical power failure or
battery disconnection.
The seat adjusting switch block in the
driver's seat communicates with the
seat cushion control module over
dedicated lines. The output stages for
seat motor movement are in the seat
cushion control module. Seat positions
are recognized through the use of Hall
sensors in the motors. All components
2/25/2009 11:03 PM