日本語版の更新はこちらを参照下さい
http://e32b12.blogspot.jp/2012/09/strange-thing-on-electric-seat2.html
http://e32b12.blogspot.jp/2012/09/strange-thing-on-electric-seat2.html
the
memory module is under the driver seat, if you take out the seat, the module
comes with the seat.
We just fixed the seat memory problem on an Alpina
B12 with sports seats, stay tune, interesting pics and findings, the problem of
not being able to use the memory function and eratic seat movement was not the
memory module, not the plugs going into the memory module, but this
part
The actual position of the motors
is fed back to the control unit with potentiometers which are integrated into
the motors.
These potentiometers were not good anymore, not the electric
part, but the plastic gears, broken teeth. That confused the whole
system.
The gearboxes of the potentiometers are adapted to the adjusting
travel in order to utilize the maximum potentiometer ranges.
Potentiometer
gear boxes must have different ratios for the identical potentiometer travel,
since the adjusting travel of a headrest is different than the adjusting travel
for axial seat movement. This difference in gearbox travel is marked on the
plug/motor with different colors of paint. We actually tried a headrest
potentiometer for seat movement, it did not work, till be found out the
difference.
All restoring potentiometer paths have a fixed resistance of 4.7
k-ohms.
The potentiometer voltage must rise in the case of positive
movement direction for the seat adjusting plane.
Positive
adjustment
-Seat height up
-Backrest forward
-Inclination front
up
-Position forward
-Headrest up
The following is applicable to
mirror drive:
Positive adjustment:
-Vertical upward
-Horizontal to
the right
The following labels are used on the potentiometer housings for
identification of the different ratios:
headrest: red, potentiometer
gearbox ratio 255
seatheight:red, " " 255
backrest:green, ratio
731
forward/backward: brown, ratio 1125
inclination:black, ratio
146.6
