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)