airbag BMW 525i 1997 E39 Owner's Guide

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51 3-1 5
I Interior Trim
Dash panel support, removing and
installing
- Remove lower dash panel. See Lower dash panel assem-
bly, removing and installing.
- Remove upper dash panel. See Upper dash assembly, re-
moving and installing.
- Remove upper steering column fasteners. See 320 Steering
and Wheel Alignment.
4 Remove dash support fasteners (arrows).
Remove wire ties as necessary and remove support.
- Installation is reverse of removal.
Rear parcel shelf, removing and installing
(models without rear
HPS airbags)
WARNING-
On 1998 and later models, rear Head Protection System
(HPS)
airbags may be installed (optional equipment). The
procedure given below does not covermodels with rear HPS
airbags. See721
Airbag System (SRS).
- Remove C-pillar trim panels. See Rear window pillar trim
panel (C-pillar), removing and installing.
- Remove rear seat backrest. See 520 Seats.
- Rear parcel shelf removing:
Remove center headrest fasteners.
Remove
seatbelt floor mounting fasteners.
Carefully pry out safety belt trim panels and feed
seatbelt
through slots.
. . . - -. . . . . . . . . Remove expansion rivets and slide pane fonvard to re-
move.
< Remove expanson r:vets (arrows).
Remove vent panels (A).
Remove speafter pane s (B).
Remove center head rest s-pporl fasteners (C).
Slioe parcel shelf forward lo remove.
- lnsta lation s reverse of removal.

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51 5-1 6
Central Locking and Anti-Theft
DOOR HANDLES AND LOCKS
In the procedures that follow, door handle removal, door lock
cylinder removal and door latch removal are covered for the
left front door. Other doors are similar although simpler, due
to the
lack of lock cylinder.
Inside door release removal is covered in the procedure for
inner door
ane el removal. See 411 Doors.
Door handle (outer), removing and
installing
NOTE-
IfBMWspecial tools 51 3201 and51 3 203 are available, the
door handle can be removed without removing the door trim
panel or door
airbag. Use the access hole behind the rubber
sealing plug on the door edge.
- Close window on front door.
- Disconnect battery negative (-) cable.
CAUTlOG
Prior to disconnecting the batter)! read the battery discon-
nection cautions given
in 001 General Warnings and Cau-
tions.
Remove front door trim panel. See 411 Doors.
Remove door-mounted air bag. See 721
Airbag System
(SRS).
Remove rubber sealing plug (arrow) from door edge
NOTE-
In the photo below, door handle and lock cylinder carrier are
shown on the work bench for clarity.
Working inside door cavity:
- Use long thin screwdriver to release locking tab A. Push
screwdriver through hole for rubber sealing plug.
Slide locking plate
B toward front of door.
Working on outside of door, lift out lower edge of handle and
pull down to remove.
Installation is reverse of removal,
Tightening torques
Airbag to door (replace screws) 8.5 Nrn (75 in-lb)

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Central Locking and ~nti-~heel
Door latch, removing and installing
- Close window on subject door and open all other windows.
- Disconnect battery negative (-) cable
CAUTION-
Prior to disconnecting the batterl: read the battery discon-
nection cautions given in
001 General Warnings and Cau-
tions.
- Remove door trim panel. See 411 Doors.
- Remove air bag. See 721 Airbag System (SRS).
- Remove outer door handle. See Door handle (outer), re-
moving and installing.
< Working inside door cavity, release loclting tabs (arrows)
and open protective cover.
Pull down on electrical harness connector (arrow) to re-
lease.
< Working inside door cavity, next to outside door sltin:
Disconnect door lock cylinder Bowden cable from latch as-
sembly arm
(A) and support (B).
Disconnect microswitch connector (arrow).

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51 5-1 8
I Central Locking and Anti-Theft
< Working at outer door edge:
Disconnect inside door release
Bowden cable guide by
sliding mounting clip (A) forward.
Remove latch mounting fasteners
(B) and (C) and remove
latch.
NOTE-
In the photo below, door handle assembly and latch assem-
bly are shown removed from the car
for clarity.
Installation: Slide latch into position in door making sure that
cross-shaped tip of door
loclc cylinder mechanism fits cor-
rectly into corresponding opening in latch mechanism (in-
set).
Remainder of installation is reverse of removal. Operate
loclc
using key before installing door trim panel.
Tightening torques
Airbag to door (replace screws) 8.5 Nm (75 in-lb)
Outer door lock cylinder, removing and
installing
- Close window on subject door. Open all other windows
- Disconnect battery negative (-) cable.
CA UTIOIG
Prior to disconnecting the baffeg read the battery discon-
nection cautions given in
001 General Warnings and Cau-
tions.
- Remove door trim panel. See 411 Doors.
- Remove door air bag. See 721 Airbag System (SRS).
- Remove outer door handle. See Door handle (outer), re-
moving and installing.
- Remove door latch. See Door latch, removing and install-
ing.

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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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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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I Seat Belts
This section covers repairs to the following seat belts sys-
tems. See the table below.
IMultIple Restraint Systems I
Years
311 996 - 811 997
Multiple Restraint System electronics integrate seat belt op-
erations and
airbag deployment. Airbag repair information is
covered
in 721 Airbag System (SRS).
Troubleshooting
The seat belt reel should lock when driving quicltly through
curves,
during severe braking or in case of a collision. The au-
tomatic reel does not require any servicing and should never
be opened.
- In case of an accident, follow the seat belt troubleshooting
procedures presented
in the table below.
Troubleshooting procedures
Belt creased, unraveled, pinched, cut or
melted. Belt buckle or belt loclt plastic casing Repairs
Replace complete automatic
seat belt.
Also
checlt and replace, if necessary, seat
Problem
Damage to seat
belt.
worn, damaged or missing.
Seat belt bucltle is not ejected with spring
pressure when red button on seat belt loclt is
>--- I I
Automatic belt soueaks when fastened or I~xcessive friction in belt guides. I Replace reel assembly.
Probable
cause
Accident in which bumper impact absorbers
were permanently deformed.
Seat belts aged or worn.
pressed.
Seat belt automatic reel does not lock when
pulled out suddenly.
Seat belt automatic reel jams when pulled
out.
Seat belt does not retract automatically
(see note below).
Automatic reel loose. Return sorino broken inside reel. belt mounting on car body and
seat belt
mounting on seat runner.
Replace complete automatic seat belt.
Seat belt
loclt mechanism worn or
damaged.
Tighten reel mounting bolt Replace reel assembly.
Replace seat belt lock.
Automatic reel defective.
Automatic reel loose. Return spring
broken inside reel.
Automatic reel loose.
Return spring brolten inside reel. Replace reel
assembly.
Tighten reel mounting
bolt.
Replace reel assembly.
Tighten reel mounting bolt. Replace reel assembly.
~ ~-~~ , - I'
Replace complete automatic seat belt.
Also check retaining bracket of belt
Seat belt
pyrotechnic tensioner triggered. Accident triggered pyrotechnic deployment.

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721 Airbag System (SRS)
........................... General ............................ 721-2 Airbags 721-8
..... E39Airbags ......................... 721-3 Driver airbag. removing and installing 721-8
Two-stage airbag (MRS 111) ............ .72 1.4 Passenger airbag. removing and installing . 721-9
Airbag indicator light .................. .72 1.4 Door mounted side-impact airbag.
............... Warninas .......................... .72 1.5 removina and installina 721-10 .
..... Head protection airbag components 721
-1 1 Airbag Electronics ................. '721-6 Head protection airbag (HpS) .......... 721-12 MRS ............................... 721-6
MRS
airbag system diagram ........... .72 1.6
MRS control module. replacing ......... .72 1.7
Side-impact crash sensor.
removing and installing
................ .72 1.7

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721 -2
l~irba~ System (SRS)
This repair group covers airbag components and replace-
ment.
Airbag system repairand fault diagnosis is not covered.
Diagnostics, component testing, and
airbag system repair
should be carried out by trained BMW service technicians.
Individual
airbag system components can only be tested elec-
tronically when installed in the car. BMW service testers
DIS
or MoDiC or equivalent must be used for diagnostic work.
WARNING-
Special test equipment is required to retrieve airbag fault
codes, diagnose system faults, and
reseffturn off the air-
bag indicator light. The indicator light will remain on until
any problem has been corrected and the fault memory has
been cleared.
Airbags are part of the BMW Multiple Restraint System
(MRS). Three versions of MRS are available in E39 models.
Multiple Restraint Systems
MRS and MRS II include the following restraint components:
311 996-811 997
911
997-311 999
311 999-2002
Driver and passenger front
airbags (MRSIMRS II)
MRS
MRS
II
MRS Ill
Passenger front two-stage airbag (cars manufactured
from
911998).
The seat occupancy sensor (SBE) is used for detection of
a passenger in the right front seat. MRS uses the SBE in-
put to determine seat belt tensioner
and/or front airbag de-
ployment thresholds.
Side impact
airbag for driver and front passenger
(MRSIMRS II)
Leftlright side impact crash sensors (MRSIMRS 11)
Side impact airbag for rear passenger (MRS II) (optional)
Head Protection System (HPS) for driver and front passen-
ger (MRS
II)
Battery Safety Terminal - BST (MRS II)
Hall Sensor seat belt switches (MRS II)
Front pyrotechnic seat belt tensioners
Fuel pump cut off message

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721 -3
Airbag System (SRS)
MRS Ill adds the following features:
MRS
Ill employs "smart" technology. Smart technology re-
fers to the control module's programming for the deploy-
ment of the airbags, in stages depending on the severity of
the impact.
Two-stage a~rbag for ooln drver and passenger Alloivs for
a softer
c~snioning elfecl when the airbags are lr ggered at
lighter impact,
MRS
Ill satellite sensors use 2 wire connectors
Rear side
airbags arrive de-activated from the factory and
can only be activated upon written request from the cus-
tomer.
Rear seat head protection is available when ordered with
optional rear seat side airbags.
E39 Airbags
Driver airbag
Passenger airbag
Head Protection System (HPS)
Inflatable Tubular Structure
(ITS) (MRS
II and MRS Ill)
Front side impact airbag
Rear door side impact airbag
(optional) (MRS I1 and MRS Ill)