turn BMW 540i 1999 E39 Workshop Manual

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SCA subsystem
1. Battery power (term. 30)
2. Battery power (term. 30)
3. SCA actuator
4. Ground (term. 31)
5. Feedback OPEN
6. Ground (term. 31)
7. General Module (GM)
8. Trunk contact switch
9. Trunk opening switch
502515990
SCA operation
Three microswitches are used to operate trunk latching sys-
tem.
Microswitch mounted on lock cylinder. Pushing lock cylin-
der in will signal GM to activate actuator and open trunk.
Q Microswitch in actuator signals GM when trunlc has re-
leased. Actuator shuts off.
When closing trunk, third microswitch (on trunk latch) sig-
nals GM to activate actuator. Cam turns to pull lid closed.
Foroverload protection,
ON duration of actuator is limited to a
max.
5 seconds.
Emergency opening of trunk is provided by a mechanical link
from the lockcylinder.
If the trunlc has been opened by the
emergency release, it can be
reclosed as a conventional lid
with normal pressure.
Tailgate and rear window locks
The Sport Wagon tailgate can be opened from:
0 Remote lkey (FZV)
Interior tailgate release button at driver's lkick panel
Unlock microswitch above rear license plate

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Central Locking and Anti-Theft
4 Remove lock cylinder carrier mounting screws (arrows).
- Working inside door cavity, turn cylinder carrier assembly
counterclockwise and carefully pull down to remove.
- Installation: Place lock cylinder carrier in position in door. In-
stall and tighten mounting screws.
- Remainder of installation is reverse of removal.
Tightening torques
Airbag to door (replace screws) 8.5 Nm (75 in-lb)
Trunk lock, removing and installing
< Remove plastic trim panel:
- Remove screw cap and screw (A).
Remove expansion rivets (B).
* Gently pry out mount clips (C).
4 To remove trunk lock:
Disconnect electrical harness
(A).
* Snap actuator rod out of mounting clip (B).
Remove fasteners (C) and remove lock assembly.
- Installation is reverse of removal
Trunk latch, removing and installing
4 Remove plastic trim panel:
Remove screw cap and screw
(A).
Remove expansion rivets (B).
Gently pry out mount clips (C).

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51 5-24
l~entral Locking and Anti-Theft
ANTI-THEFT SYSTEM (DWA)
When the anti-then system (DWA) is armed, the doors, hood,
windows, trunk lid or tailgate are monitored against forcible
entry by switches and sensors. The vehicle is protected
against being jacked up or towed away by a tilt sensor.
The control electronics for DWA are integrated in the General
Module (GM). In addition to the control electronics, the sys-
tem includes the following components.
* DWA horn
DWA LED indicator
- Tilt sensor
- Monitoring switches and sensors
The system can be armed or disarmed from the driver's door
lock,
trunklid lock, tailgate lockorthe remote transmitter (FZV
Itey). When armed, the alarm horn
soundsfor30seconds and
the low beam headlights and turn signals flash for
5 minutes.
The electronic immobilizer (EWS) is also activated when
DWA is activated.
The alarm is switched off immediately if key is inserted in door
loclt or FZV key button is used.
DWA LED Status
The DWA status LED is located in the rear view mirror (ar-
row). When DWA is armed, the LED flashes slowly to indi-
cate armed status.
The LED and exterior lights flash once and the alarm horn
sounds when the system is successfully armed ordisarmed.
The LED will continue to flash slowly denoting the armed sta-
tus. If any monitored input is not closed when the system is
armed, the LED will flash rapidly for
10 seconds to indicate
the fault.
Tilt sensor
-
4 The tilt sensor, located on the left side of trunlt or cargo com- -
partment, consists of a conductive liquid chamber, a proces-
sor board and metal probes. The probes are submersed in
the liquid and produce a resistance value dependent on the
tilt of the sensor (angle of the vehicle). This resistance be-
comes the reference value when the DWA system is armed.
.-

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51 5-26
Central Locking and Anti-Theft
Interior sensor UIS (2000 and later models)
The
UIS system uses ultrasonic sound waves instead of elec-
tromagnetic waves. Ultrasonic sound waves are less suscep-
tible to magnetic interference.
Every time the DWA system is armed, the sensor adapts to
whatever objects might be stationary in the interior. The sen-
sor emits ultrasonic waves in a programmed timed cycle. It re-
ceives echoes of the emitted waves. The
UIS amplifies the
received sound wave signals and compares them to the ech-
oes of the transmitted waves. The
UIS also checits the incom-
ing echoes for background hiss (wind noise through a
partially open window) and adapts for this.
If the echoes are consistently similar, no movement is de-
tected.
If the echoes are altered, (inconsistent), the UIS deter-
mines motion in the interior compartment.
If motion is detected, the
UIS changes to a constant cycle
and the echo is compared again.
If the inconsistency is still present the
UIS sends the acti-
vate siren signal to the GM.
Glass breakage sensors
The doorwindows are monitored by inductive sensors mount-
ed on the inside of the door behind the trim panel. A closed
window is recognized by a magnetic plate
on the glass lining
up with the sensor. If the glass is broken, the plate falls away
and the signal from the sensor changes. This causes the GM
to activate the alarm.
Emergency disarming
- An emergency procedure is provided to cancel the DWA in
the event that a fault occurs within the system. The procedure
is as follows:
Driver's door mechanically
unloclted and open within 30
seconds. This will cause triggering of alarm.
All doors closed.
Ignition switch turned to
KL R (ACCESSORY). LED indica-
tor will come on.
- After 10 minutes, alarm is disarmed

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l Seats
Seat repair and component replacement is possible once the
seat has been removed from the vehicle.
Before servicing front seats read safety regulations on han-
dling
airbag modules and pyrotechnic seatbelt tensioners.
See
720 Seat belts and 721 Airbag system (SRS).
WARNING-
. The front seats are equipped with pyrotechnic seat belt
tensioners. These tensioners are powerful devices and
should be handled with exfreme care. Incorrect handling
can trigger off the tensioner and cause injury.
BMW recommends that all repair or replacement
worlc
on pyrotechnic devices must be carried out by a quali-
fied
BMW technician.
Be sure to disconnect the battery and wait
5 seconds
before attempting to work on pyrotechnic devices.
During body straightening and welding with an electric
arc welder, always disconnect the battery and the con-
nection to the pyrotechnic gas generators.
Seat switch and memory module, removing
and installing
- Remove front seat. See Front seats, removing and install-
ing.
- Carefully pull seat adjusting ltnobs straight out to remove.
Remove screw fastener
(A) and trim clips (B), turn side panel
downward to remove.
Disconnect electrical harness connector
(arrow).

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520-5
Seats
1
4 Release mounting tabs (arrows) and remove switch module.
Front seat, removing and installing
- Turn ignition switch to OFF position.
Remove front and rear rail trim panels:
Raise center of trim panel
(A) to release loclting pin.
Unlock and lift out inner mounting clips tabs
(6).
Slide trim panel off rail (arrow) to remove.
< Remove seat belt mounting fastener (arrow) from seat
frame.

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Sunroof, normalization
During normalization the mechanical end positions of sunroof
movement are detected and stored by the General Module
(GM
Ill).
,:..I:,* *:3F$&-T , a,.,-. . 2 *i;.'I . :i_(,*,,_ _* Press and hold sunroof switch in "lift" direction.
Afler reaching end position
(A), keep switch pressed for
approximately
20 seconds longer.
- Normalization is complete when sunroof in lifl position (A)
moves briefly in direction of (6).
E39 models up to 311 998
- The characteristic curve for E39 models built up to 311998 is
learned automatically during operation. After normalization,
open and close sunroof once by pressing switch.
NOTE-
In the event of a faulty triggering of the anti-trap protection in
a specific position, the fault can be rectified
by moving over
the relevant position several times.
E39 models from 311 998
- Characteristic curve is learned manually in the following
steps:
Release switch after normalization for maximum of
5 sec-
onds.
Then hold down switch in sunroof raising position until sun-
roof has returned to closed position after a complete open-
ing operation.
Characteristic curve learning is complete, release sunroof
switch.
NOTE-
Carry out function check (tip function, anti-trap protection
and, if necessary, comfort function).

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-.
Sunroof
Sunroof panel, emergency closing
4 Using a plastic tool carefully pry interior light out of headliner.
4 Remove access panel from below sunroof motor by inserting
fingers through light opening and pressing down.
4 Disconnect electrical connections (arrow) and lay switch
panel aside.
4 Insert hex ltey into drive in sunroof motor (arrow), and turn
hex ltey to manually close sunroof.
NOTE-
The hex ley for manually (emergency) closing the sunroof
can be found in the tool
Itit located in the trunk lid (sedan
models) or under the cargo area floor panel (Sport Wagon).

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Sunroof, adjusting
The sunroof is controlled by a set of cables that move the sun-
roof panel along guide rails when the motor is operated. The
sunroof can be adjusted without removing it from the car.
NOTE-
Be sure to check drains in front corners of sunroof carrier if
water is entering car through headliner.
- The sunroof panel should be adjusted under the following cir-
cumstances:
Sunroof misaligned with roof.
Sunroof does not close squarely.
* Wind noise at high speeds (sunroof closed).
Sunroof has been removed.
For correct sunroof alignment:
Sunroof must be fully closed.
Gap must be even all around edge of sunroof.
Front of sunroof must be flush to
1 mm (0.04 in.) below sur-
face of roof.
. Rear of sunroof must be flush to 1 mm (0.04) above sur-
face of roof.
NOTE-
Use a credit card to measure the gap. The card sllould insert
through the gap with equal resistance all around the perimeter.
Sunroof with steel roof panel, adjusting
- The headliner panel must be disengaged from the drive as-
sembly and moved rearward in order to access the roof panel
attaching screws.
CAUTIOI\C
Sunroof panel must never be moved to open position when . .
I the headliner is disenaaaed. 1
- Start with a fully closed roof panel.
- Remove drive motor access cover. See Sunroof motor, re-
placing.
Using hex key from tool kit, turn motor drive 90" counter-
clockwise.
Rear of sunroof panel will drop
2 to 3 mm (0.08 to 0.12 in).
This disengages headliner from sunroof panel.
- Push headliner panel rearward, exposing roof panel attach-
ing screws.

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l Sunroof
4 Adjusting rear roof height:
Remove fasteners
(A) and (6)
Slide in left and right side adjusting wedges (C) until ideal
setting is reached.
Press sunroof panel forward and tighten wedge nuts
(6).
* Tighten center nut (A).
4 Adjusting front roof height.
Loosen lefl and right fasteners
(A)
Set front of sunroof to ideal height by moving panel up or
down.
Tighten fasteners
(A).
Insert hex key in drive motor and turn 90" clockwise.
Pull headliner panel forward until it locks in place.
Tightening torque
Wedge locking nuts 1.5 Nm (1 3 in-lb)