1999 BMW 540i Interior

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51 5-1 5
Central Locking and Anti-Theft
Any of these input requests to the GM activates the tailgate
latch motor. The
GM will also switch on the interior lights with
a tailgate unlock request.
The rearwindow is opened with the release switch on the rear
wiper arm cover. Pressing the switch signals the GM to acti-
vate the rear window release relay.
Sport Wagon tailgate and rear window lock
schematic
Inputs Outputs
"UiRWiNOOW ACTUATOR RELAY
RUiRWINDOW ACTUlimR A L
WIPERS

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51 5-25
Central Lockina and ~nti-~heftl
1
Tilt sensor operation:
1. DWA armed, vehicle level. Tilt sensor sends HlGH sig-
nal to General Module (GM).
2. DWA armed, vehicle tilted. The fluid moves in sensor,
changing resistance value.
HlGH signal changes to
LOW signal. GM activates alarm.
If the vehicle is jacked up or lifted in any way, the angle of the
liquid changes, producing a change in the resistance value.
The sensor signals the GM to activate the DWA alarm. The
sensor resets at the new angle.
This allows the DWA system
to remain armed and to reactivate the alarm if tlie vehicle is
moved again
Locking the vehicle twice within a few seconds will deactivate
the tilt alarm sensor while arming tlie remainder of the sys-
tem. This allows the vehicle to be transported in an armed
state without activating tlie alarm.
Interior protection
The interior motion sensor is mounted in the center of the
headliner panel. Due to the design of the vehicle interior, the
sensor must be installed in the correct direction to ensure
proper operation of the system.
lnterior sensor FIS (1997 - 1999 models)
4 When the alarm system is armed, the FIS sensor emits elec-
tromagnetic waves at
a frequency of 2.45 GHz. As long as
nothing is moving in the vehicle, the waves are reflected
baclc
to the sensor at the same frequency. If a foreign object enters
the vehicle, the frequency of the reflected signal changes.
The sensor detects the changed frequency and triggers the
alarm.
Every time the DWA system is armed, the sensor adapts to
whatever objects might be stationary in the interior. This al-
lows pacltages or objects to be left inside tlie car without ef-
fecting the operation of the system. The sensitivity of the
sensor is set so that the moving object must be at least as
large as a bumble bee. This prevents a false alarm from oc-
curring if a small insect is caught in the vehicle.
FIS is switched off when the vehicle is locked two times within
ten seconds. The DWA LED will flash one time for confirma-
tion. This allows the sensor to be switched off to avoid false
alarms when the windows are left open for venting.

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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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540-2
Sunroof
This repair group covers the slide-tilt sunroof assembly.
There are two types of sunroof panels available: steel
01
glass. Service procedures are different for each type.
Component locations, initialization, sunroof panel replace-
ment, and sunroof height adjustment are covered. Replace-
ment of the cable assembly or frame require that the
headliner be removed. Removal and repair of the sunroof as-
sembly and othercomponents inside the roof cavity is beyond
the scope of this manual.
When the sunroof is set to the vent position (rear of panel up),
the inside headliner moves rearward approximately
120 mm
(4.7 in) This provides cabin ventilation with less wind noise. A
water channel is incorporated into the sunroof assembly. It
automatically rises when the sunroof panel is in the vent posi-
tion and prevents water from entering the interior during brak-
ing.
Sunroof electronic controls, initializing
- Initialize the sunroof in the following situations:
Malfunctions
such as lack of one-touch function, lack of
comfort openinglclosing or lack of safety (anti-trapping)
features.
If sunroof motor has been removed and reinstalled.
If power supply to the sunroof has been interrupted.
If repairs have been performed on the slideltilt mechanism.
NOTE -
The initialization sequence is dependent on the software ver-
sion of
tlie sunroof module (in the sunroof drive unit).
I WARNING -
I There is no anti-trapping protection during initialization. I

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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
Sunroof motor, replacing
Remove interior light from below sunroof motor by gently pry-
ing with a plastic tool.
4 Remove access panel from below sunroof motor by inserting
fingers through light opening and pressing down.
4 Remove sunroof motor mounting screws (arrows).
- Installation is the reverse of removal. Perform initialization
procedure as described earlier. See Sunroof electronic
controls, initializing.
Tightening
torque
Sunroof motor to sunroof carrier 2.8 Nm (25 in-lb)

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-- -
Seat Belts
Rear seat belts (sedan)
- Remove rear parcel shelf to access shoulder belt assembly
mounting bolts. See 513 Interior Trim.
- Remove rear seat cushion to access rear seat belt lock
mounting bolts. See 520 Seats.
- When installing seat belt lock straps:
Install right lock strap (which is shorter) underneath middle
lock strap.
Install left lock strap underneath middle lap belt strap.
Metal strap ends must rest against stop on floor under-
neath seat.
Rear seat belt assembly
(Sport Wagon)
1. BoltMlO
(tighten to 31 Nm, 23 ft-lb)
2. Right shoulder belt reel
assembly
3. Center belt lock
4. Right belt lock
5. Left belt lock
6. Center shoulder belt reel
assembly
7. Left shoulder belt reel assembly
8. Bolt
MI2
(tighten to 48 Nm, 35 ft-lb)

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2 INDEX
Battery, starter, alternator
alternator (generator)
121-10
6-cylinder engine, removingi
installing 121-15
M62 engine 121-16
M62 TU engine (water cooled)
121-18
battery
121-5 charging 121-9
safety terminal 121-3
testing 121-5 charging system, troubleshooting
121-12
starter
121-1 9
6-cylinder engine, removingi instaliinq 121-20 . V-8 engine, rernovinglinsialiing
121-21
solenoid, removinglinstalling
121-23 troubleshooting 121-19
see also Maintenance
Bearing, wheel
see Front suspension
see also Rear suspension
Belts see Maintenance, drive belts
Blade, wiper
see Wipers and Washers
Blower motor see
A/C
BMW emblem
see Exterior trim
BMW special tools 010-18 see also special tools section at
beginning
of each repair group
Body dimensions 400-2
interior features
400-9 salety and security 400-7
Body side molding
see Exterior trim
Bonnet see Engine hood
Boot see Trunk
Brake fluid
020-24, 340-8
Brake fluid pressure sensor
340-30
Brakes
ABS, ASC or DSC system
300-12
component replacement 340-26
ASCIDSC switch
see Switches
bleeding
bralces 340-8
brake booster 340-1 9 bralce Dads. caiioers and rotors ,., 340-1 1
descriotion 300-10
e~ectrdnic brake & stability 300-11
light switch
see Switches
master cylinder
340-16 pariking brake 340-22
troubleshooting 340-5
Bulbs see Lights
Bumper
lront 510-6 height, adjusting 510-12
rear 510-9
Bus system
600-4
Camber
320-33
Camshaft
removingiinslaiiing
M52 engine 116-12
M52 TU
/ M54 engine 116-1 9 M62 engine 11 6-39
wear
116-6
Camshaft position sensors
see ignition system
Camshaft timing chain
adjusting M52 engine
117-22
M52 TU I M54 engine 117-43
M62 engine 117-79 removinglinstalling
M52 engine 117-26
M52TU 1 M54 engine 113-46.116-
28
M62 engine 117-66
Capacities, fluid
020.10
Car rnemorvlicev memorv . . 600-10
see also Centrai
lociking
Carbon canister, activated
see Fuel
tank
Caster
320-33
Catalytic converter and oxygen sensor 020-19
see also Exhaust system: exhaust
manilolds
Cautions
001-3
CD changer
650-4
Center bearing, driveshaft
see Driveshait
Center brake light
sedan
630-13
Center console
513-3
Centrai body electronics (ZKE 111)
600-6
Central locking
car memoryiey memory 515.12 general module iunctions 515-2
remote entry (FZV) 515-8
remote lkey initialization 515-10 single lociddouble ioclk 515-6
switch 515-4
Chain
see Camshaft liming chain
Characteristic map (electrically heated) thermostat
see Electrically heated thermostat
Charging system
see Battery, starter, alternator
Cluster see instruments
Clutch fluid see Maintenance
hydraulics
210-4
mechanical 210-9
switch
see Switches, pedal ciuster
variations
210.10
Codes, fault OED-1
Coil
see Ignition system
Coil spring
see Front suspension
see also Rear
suspe nsion