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Honda Bmw 5 Service Manual

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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 modules 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)   
    						
    							
    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.   
    						
    							
    Airbag System (SRS)~ 
    Warnings 
    When servicing airbag equipped  cars, the following  precau- 
    tions  must be 
    observed to prevent  personal  injury. 
    WARNING- 
    . If the airbag indicator light  is on, there  is a risk  that  the air- 
    bags will not be triggered  in case  of an  accident  Be sure 
    to  have  the system inspected  and repaired immediately 
    Airbag(s) are inflated  by an  explosive device. Handled 
    improperly  or witliout  adequate safeguards, the system 
    can  be very  dangerous. Special precautions  must be 
    observed  prior to any  work at or  near  the airbags. 
    0 The airbag is a  vehicle safety system.  Serious injury 
    may  result  if system service  is attempted by persons 
    unfamiliar with  the BMW 
    MRS and its approved service 
    procedures.  BMW advises that  all inspection  and ser- 
    vice  be performed  by an  authorized  BMW dealer. 
    Always  disconnect the battery  and cover the negative 
    (-) battery terminal  with an insulator before starting  di- 
    agnostic,  troubleshooting  or service 
    work not associat- 
    ed 
    with the airbags,  and before doing any welding  on 
    the  car. 
    0 After  disconnecting  the battery, wait 5 seconds before 
    beginning  work  on 
    airbag components. 
    * If an airbag has been  activated due to  an accident, 
    BMW specifies  that 
    airbag components  be replaced. 
    For  more  information  on post-collision 
    airbag service, 
    see  an authorized BMW dealer. 
    Do  not fire an 
    airbag unit prior  to disposal. It must  be 
    fired  by a special  disposal company  or shipped  back to 
    BMW  in the packaging  of the  new  components. 
    When removing a fired 
    airbag unit, avoid contact  with 
    the 
    skin; weargloves.  In case ofskin contact, wash with 
    water. 
    Do  not  allow 
    airbag system components to come in 
    contact  with cleaning  solutions or grease.  Never sub- 
    ject 
    airbag components  to temperatures above 167°F 
    (75°C). When reconnecting  the battery,  no person 
    should  be inside  the vehicle. 
    Always  place an 
    airbag unit that has been removed 
    from its 
    packaging with  the paddedside  facing upward. 
    Do not leave  an 
    airbag unit unattended. 
    0 If the airbag unit or airbag control module has been 
    dropped  from a height  of 
    /? meter (I//: ft.) or more, the 
    airbag unit should  not be installed.   
    						
    							
    721-6 
    I Airbag System (SRS) 
    MRS 
    The MRS  control  module contains the electronic crash sensor 
    for  frontal impact.  Sensors mounted  on the driver  and 
    pas- 
    sengerfloor  are used for side impacts.  The MRS  control mod- 
    ule 
    is located  between the front seat under the center 
    console. 
    MRS airbag system 
    diagram 
    1. Drivers  side airbag 
    2. Passengers  side airbag 
    3. Right side impact  sensor 
    4. Seat occupancy  sensor pad 
    5. Right side impact airbag 
    6. SBE control  module  (analog to 
    digital  converter) 
    7. Passenger  pyrotechnic  seat belt 
    tensioner and  seat belt 
    mi- 
    croswitch  (Hall sensor  MRS Ill) 
    8. MRS control  module 
    9. Driver pyrotechnic  seat belt ten- 
    sioner  and seat  belt microswitch 
    (Hall  sensor  MRS 
    Ill) 
    10. Left side  impact airbag 
    11. Left side impact sensor   
    						
    							
    Airbag System (SRS)~ 
    MRS control module, replacing 
    - Disconnect  negative (-) cable from  battery and cover nega- 
    tive  terminal  with insulating  material. 
    CAUTIOI\C 
    Prior to disconnecting  the battery,  read the battery  discon- 
    nection cautionsgiven  in001 General  Warnings  and 
    Cau- 
    tions. 
    - Remove center console  between front seats. See 513 lnteri- 
    or Trim. 
    Remove module  mounting nuts (arrows)  and lift up  control 
    module. Disconnect electrical  harness connector. 
    Installation is reverse  of removal. 
    Be  sure that  MRS control  module ground cable is attached 
    to  the  module  mounting  stud. 
    Side-impact crash  sensor, removing and 
    installing 
    - Make sure ignition key is  OFF. 
    - Remove front  seat. See 520 Seats. 
    Remove plastic door sill  trim by lifting  to release clips  at one 
    end,  then  sliding  off. Fold up  carpet towards rear seat floor.  If 
    necessary, remove floor  level heater  duct.   
    						
    							
    721 -8 
    (Airbag System (SRS) 
    4 Remove electrical harness  connector from crash  sensor (A). 
    Remove sensor  retaining  screws (6) and remove sensor. 
    Note  direction  of sensor  before removing. 
    - Installation  is reverse of removal, 
    NOTE - 
    Arrow  on sensor must  point to door  sill. 
    Driver airbag, removing and installing 
    - Disconnect negative (-) cable  from battery and  cover nega- 
    tive  terminal with insulating material. 
    WARNING- 
    After disconnecting  the batter)!  wait 5 seconds  before begin- 
    ning  work  on 
    airbag components. 
    CAUTION- 
    Prior  to disconnecting  the batter)!  read the battery  discon- 
    nection  cautionsgiven 
    in001 General  Warnings  and Cau- 
    tions. 
    4 Multifunction (MFL) steering  wheel: 
    . Working behind steering  wheel, completely loosen  Torx 
    screws 
    (T30) while holding airbag in  place. 
    Support 
    airbag unit  to prevent  it from  falling  out.   
    						
    							
    721 -9 
    Airbaq System ~SRS)~ 
    4 Sport steering  wheel: 
    Insert screwdriver  through opening  in rear  of steering 
    wheel  and push  against spring tension  to release 
    airbag 
    unit  lock. 
    Repeat  procedure  on other side  of steering  wheel. 
    Lift  off 
    airbag unit  and  detach electrical harness connec- 
    tors. 
    WARNING- 
    Store the removedairbag  unit with  the horn pad  facing up. 
    If stored  facing down, accidental deployment could propel 
    it  violently  into the air, causing  injury. 
    Once  an 
    airbag is removed, the car must  not be driven. 
    Do  not connect  the  battery with the 
    airbag disconnect- 
    ed.  A fault  code  will be stored, setting  off the 
    airbag in- 
    dicator  light Special tools  are needed  to reset the fault 
    memory 
    Once  the 
    airbag unit is installed and  all other service 
    procedures have  been completed,  start the engine and 
    check that  the 
    airbag indicator light  goes out. If the  in- 
    dicator light stays on,  the 
    airbag system will not func- 
    tion  as designed.  Have the system diagnosed and 
    repaired  by an authorized 
    BMW dealer. 
    - Installation  is reverse  of removal. 
    MFL steering  wheel: Torque airbag using specification  list- 
    ed  below. 
    - Sport steering  wheel: Press airbag unit mounting  pins into 
    spring 
    loclts in  steering  wheel  until they  snap in firmly. 
    CAUTION-- 
    Do notpinch airbag harness  in center  of steering  wheel when 
    installino 
    airbaa. 
    Tightening torque 
    Airbao  to steerino wheel IMFL) 8 Nm (71 in-lb) 
    Passenger airbag, removing  and installing 
    - Disconnect negative (-) cable  from battery  and cover  nega- 
    tive terminal  with insulating  material. 
    -- 
    WARNING - 
    After disconnecting the batteg wait 5 seconds  before begin- 
    nina work on airbaa components. 
    Prior to disconnecting the battery,  read the battery  discon- 
    nection  cautionsgiven in001  General Warnings  and 
    Cau-   
    						
    							
    721 -1 0 
    /Airbag System (SRS) 
    4 Pry up cover  from top of passenger  side airbag on dash- 
    board. 
    4 Remove airbag mounting  bolts (arrows) 
    - Lift airbag and disconnect  electrical harness connector. Re- 
    move 
    airbag. 
    WARNING- 
    Store  the removed airbag unit  with the  soft pad  facing up. If 
    stored  facing down,  accidental  deployment  could propel  it vi- 
    olentlv into  the 
    ail: causino inium 
    - Installation is reverse of removal. Make sure wiring  harness 
    is not  pinched  when  installing 
    airbag unit in dashboard. 
    Tightening torques 
    - 
    Passenger alr bag  to 10 NM (88 in-lb) 
    dashboard (Me) 
    Door mounted side-impact airbag, 
    removing and installing 
    - Disconnect negatlve (-) cable  from battery  and cover  nega- 
    tive  terminal  with insulating  material. 
    CAUTION- 
    Prior to disconnecting  the battea read the battery discon- 
    nection  cautions  given 
    in 001 General  Warnings  and Cau- 
    tions. 
    - Remove inside door  panel as described  in 41 1 Doors   
    						
    							
    721 -1 1 
    Airbag System (SRS)~ 
    Front door airbag: 
    Remove airbag mounting bolts (arrows). 
    Disconnect electrical  harness connector. 
    CAUTIOI\C 
    When removing andinstalling  the airbag unit, pay attention to 
    the  routing 
    of the  electrical harness to avoid kinks  or breaks 
    in  the  wire. 
    Installation is reverse  of removal, 
    Rear door 
    airbag: 
    Detach electrical  harness connector. 
    Remove  mounting  bolts and remove 
    airbag from door. 
    - Installation is reverse  of removal. 
    Route electrical  harnesses as they  were before. 
    Use  new wire  ties as necessary. 
    Use  new self-locking  mounting bolts. 
    Tightening 
    torque 
    Side-impact airbag to  door 8.5 Nm (75 in-lb) 
    Head protection airbag 
    components 
    1. B-pillar  deflection plate 
    2. Head protection airbag 
    3. Cable  holder 
    4. Gas generator   
    						
    							
    721-12 
    Airbag System (SRS) 
    Head protection airbag (HPS) 
    4 Replacement of a head protection airbag (HPS) is  an exten- 
    sive operation,  including removal of the following: 
    Complete  dashboard 
    Complete headliner 
    Windshield pillar  (A-pillar) trim 
    Door  pillar  (B-pillar) trim 
    - Before starting  work on the  HPS airbag, disconnect negative 
    (-) cable from battery  and cover negative  terminal with insu- 
    lating material. 
    Prior to disconnecting the  battery, read the battery  discon- 
    nection cautionsgiven  in001 General Warnings  and Cau- 
    tions. 
    Tightening torque  HPS 
    airbag to  body 11 Nm (8 ft-lb) 
    HPS airbag mounting bracket 
    to A or B-pillar 
    HPS gas  generator  to 
    dashboard  reinforcement 
    (M6 
    self-tapping  screw)  2.5 
    Nm  (22 in-lb) 
    4 Nm (35 in-lb)   
    						
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