BMW 3 (E46). Manual — part 226
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
of the seat memory system are
monitored for faults. Access the fault
codes using BMW scan tool DIS or
MoDiC.
In Coupe and Convertible models, the
easy entry feature facilitates access to
the rear seats. When a front backrest is
folded over, the entire seat moves
forward 90 mm (3.54 in.) to facilitate
rear entry. In models with seat memory,
the seat control module memorizes the
position of the seat and headrest when
the entry aid feature is activated. The
seat will return to its previous set
position when the entry aid button is
pressed rearward or the seat backrest
is locked.
The passenger's seat on four door
models uses a simplified control
system within the switch block and
does not include a memory module. No
on board diagnostics are incorporated
into the passenger seat on these
models.
Driver seat memory module
Passenger seat memory module
Rear seat configuration
Split rear folding seats are optional in
the Sedan and standard in the Sport
Wagon and Coupe. They are split 1/3
right to 2/3 left with a folding center
armrest in the left portion. The armrest,
when folded down, is equipped with a
storage compartment and cupholders.
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