1999 BMW 525i Workshop Manual

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Seat Belts
Remove lower B-pillar (door pillar) plastic trim
Pry carefully along bottom of trim to disengage
pillar.
Slide trim down (arrow) and out to remove. clips
from
4 Carefully pry bottom of upper door post trim away from post
to release clips.
Slide upper trim panel down (arrow) to remove.
Remove automatic reel from B-pillar:
- Remove upper seat belt anchor bolt (A).
Remove cross-brace mounting bolts (B).
Remove sound insulation at base of 8-pillar.
Then remove automatic seat belt reel mounting bolt
(C).
Lift out reel.
If it is necessary to remove sliding seat belt height adjuster,
unscrew mounting bolts from B-pillar.

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720-8
I Seat Belts
When Installing automatic reel housing to 5-pillar, slide tab
into locating slot (arrow).
Remainder of installation is reverse of removal
Tightening torques
- -.
Front seat to floor (M10) 42 Nm (31 ft-lb)
Seat belt to seat 48 Nm (35 ft-lb)
Seat belt to height adjuster 31 Nm
(23 it-lb)
Seat belt reel to €3-pillar bottom 31 Nm (23 ft-lb)
Sliding height adjuster to €3-pillar
24 Nm (18 ft-lb)
Rear seat belt assembly
(sedan)
1. Center shoulder belt reel
assembly
(if equipped)
2. Right shoulder belt lock
3. Lap-belt assembly
4. Left shoulder belt lock
5. Bolt MlO
(tighten to 31 Nm, 23 ft-lb)
6. Left shoulder belt reel assembly
7. Center shoulder belt lock
(if equipped)
8. Bolt M12
(tighten to 48 Nm, 35 ft-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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720-1 0
Seat Belts
Rear seat belts (Sport Wagon)
- Center shoulder belt:
Remove shoulder belt guide trim at top of seat backrest.
Feed belt out through slot in trim. Working in cargo com-
partment, partially remove backrest cover to access shoul-
der belt reel.
Remove shoulder belt reel mounting bolt inside backrest.
- Outboard shoulder belt:
Remove roof-pillar (C-pillar) trim.
Remove center shoulder belt.
- Lift up rear seat cushion(s) to access rear seat belt loclc
mounting
bolt(s).
- When installing seat belt loclc straps:
Install right belt loclc strap (which is shorter) underneath
center belt lock strap.
Install left belt loclc strap underneath center lap belt strap.
- Metal strap ends must rest against stop on floor underneath
seat.

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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)

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I Airbag System (SRS)
Two-stage airbag (MRS Ill)
Beginning with 2000 model year (911 999 production) the front
airbags were changed to a two-stage style airbag. This en-
sures that the force of
airbag inflation is not greater than nec-
essary to provide
protection. The airbags are designed to
Drovide "soit" de~lovment if the acceleration sensor detects a
iow-speed impact, and "hard deployment in higher speed im-
pacts.
NOTE-
A two-stage passenger airbag was used on cars built be-
tween
9/1998 and 3/1999. This pre-smart technology airbag
used two ignition stages. Stage one is designed to ignite first
during an impact. Stage two ignites after a timed period, as
programmed in the MRS
I1 control module.
Airbag indicator light
The MRS control module detects and stores system status
The
airbag indicator light in the instrument cluster displays
the status of the
airbag system when the ignition key is in "ac-
cessory" or
ON positions.
System normal: lndicator light comes on briefly, then goes
out.
- System malfunction: lndicator light fails to come on.
System malfunction: lndicator light comes on briefly, goes
out and lights up again.
The
airbag indicator light also comes on if the seat belt pyro-
technic tensioners have been triggered.