Air Bag Bmw 528i.pdf

AIR BAG RESTRAINT SYSTEM Article Text 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:19PM

ARTICLE BEGINNING

1998 AIR BAG RESTRAINT SYSTEMS BMW 5 Series DESCRIPTION & OPERATION

WARNING: To avoid injury from accidental air bag deployment, read and carefully follow all WARNINGS and SERVICE PRECAUTIONS. The main components of Supplemental Restraint System (SRS) include a driver-side air bag module (located in center of steering wheel), passenger side air bag module (located inside instrument panel, above glove box), side air bag modules (located in both front doors and optionally in both rear doors also), head protection system (located around top of front door opening), electronic SRS control unit, contact ring, energy capacitor/voltage transformer (integrated into SRS control unit), SRS warning light, driver-side knee bolster mounted under steering column, seat belt contacts, and Emergency Tensioning Retractor (ETR) seat belt assemblies. For SRS to operate properly, 3-point seat belts must be worn. When SRS control unit senses an impact, it transmits a voltage signal to gas generator pellets in air bag modules and the ETR seat belt assemblies. The voltage signal ignites gas generator pellets to produce a quantity of non-toxic nitrogen gas. In the air bag modules, the nitrogen gas passes through a tiny filter to fill and deploy the air bags in about 30 milliseconds. After the air bags inflate to maximum expansion, the nitrogen gas is released away from driver through 2 ventilation holes in rear of air bag. The air bag inflation and collapse sequence takes about 30-35 milliseconds. In the Emergency Tensioning Retractor (ETR) seat belt assembly, the ignited nitrogen gas forces a piston to be driven downward in a tube attached to seat belt assembly. Piston has a cable attached to it. Cable pulls on seat belt reel, increasing seat belt tension and holding front seat occupant(s) tightly against seat backrest. SRS ACTIVATION

SRS is activated when SRS control unit detects a frontal impact exceeding programmed threshold. The SRS control unit checks the status of various sensors and deploy different parts of the SRS system as needed. Both front seat belt latches are equipped with microswitches wired to the SRS control unit. Driver-side air bag will not be deployed by the SRS control unit if driver seat belt is buckled and impact severity is light. If belt is not buckled or impact is more severe, driver-side air bag will deploy. Passenger-side air bag will not be deployed if seat belt is buckled and impact severity is light. If belt is not buckled, or in a

AIR BAG RESTRAINT SYSTEM Article Text (p. 2) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:19PM

more severe frontal impact, passenger-side air bag will deploy. Seat belt contact micro-switches are also used to control emergency tensioning retractors. SRS control unit will only deploy belt tensioning retractors on belts that are buckled. In the event a frontal impact occurs while SRS control unit detects faults in any sensors, control unit will deploy all air bags and emergency tensioning retractors in seat belts. CONTACT RING

Contact ring (mounted on steering column, under steering wheel) is a continuous loop of wire ribbon that forms an electrical circuit between the steering wheel and steering column. This wire ribbon winds and unwinds to ensure electrical contact when the steering wheel is turned. A replacement contact ring may come with a lock screw to keep the contact ring centered until it is installed. For centering procedure, see CONTACT RING under ADJUSTMENTS. DRIVER-SIDE AIR BAG MODULE

Driver-side air bag module consists of an inflatable air bag, gas generator and ignitor. The gas generator and ignitor make up the inflator unit, which is mounted permanently on rear of air bag module. A 2-wire connector with gold-plated terminals is mounted inside inflator unit, at rear of air bag module. When 2-wire connector is disconnected, a safety shorting spring inside inflator connector spreads open, touching both terminals. This prevents air bag module from inflating if voltage is accidentally applied across terminals. A 2-wire connector with gold-plated terminals is mounted inside inflator unit, at rear of air bag module. When 2-wire connector is disconnected, a safety shorting spring inside inflator connector spreads open, touching both terminals. This prevents air bag module from inflating if voltage is accidentally applied across terminals. PASSENGER-SIDE AIR BAG MODULE

Passenger-side air bag module is installed inside instrument panel, above glove box. It is accessible by removing tray or panel on top of passenger side instrument panel. Air bag module consists of large inflatable air bag, 2 gas generators, and 2 igniters. Air bag fully inflates in about 35 milliseconds. Gas is then released through a filtered vent on the windshield side of the air bag, causing it to deflate. SIDE AIR BAG MODULE

Side air bag modules are installed behind door trim panel on both front doors. They are accessible by removing door trim panel of appropriate door. Side air bag module consists of an inflatable air bag, gas generator, and igniter. Air bag fully inflates in about 35 milliseconds. Gas is then released through a filtered vent on the back side of the air bag, causing it to deflate.

AIR BAG RESTRAINT SYSTEM Article Text (p. 3) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:19PM

SIDE IMPACT HEAD PROTECTION SYSTEM (HPS)

Side impact Head Protection System (HPS) consists of air bag modules which are installed along both front pillars and over front doors. They add additional protection for the driver and passenger in the event of a severs side impact. Module consists of an inflatable tube-shaped air bag, gas generator, and igniter. Air bag fully inflates in about 35 milliseconds. Gas is then released through a filtered vent causing it to deflate. EMERGENCY TENSIONING RETRACTOR (ETR) IN SEAT BELT

Emergency Tensioning Retractor (ETR) in seat belt assembly contains a gas generator pellet. When air bags deploy, SRS control unit ignites gas generator pellet and forces a piston downward in tube attached to seat belt assembly. Piston has a cable attached to it. Cable pulls on seat belt reel, taking up seat belt slack. This increases seat belt effectiveness. Not all vehicles are equipped with this system. ENERGY CAPACITOR

If normal power source (battery voltage) is interrupted during a collision, energy capacitor inside SRS control unit supplies SRS power. If energy capacitor fails, a code sets. SEAT BELT CONTACTS

Seat belt contact sensors are used to signal SRS control unit. Both front seat belt latch assemblies are equipped with microswitches. SRS control unit utilizes switched ground input signal to determine seat belt status. Not all vehicles are equipped with this system. SEAT OCCUPANCY MODULE (SBE) (ANALOG TO DIGITAL CONVERTER)

Output signals from the passenger-side seat occupancy sensor pad are converted from a varying analog signal to a digital pulse signal by the SBE. This signal is then sent to the SRS control unit to assist it in making deployment decisions. SBE module is located under passenger seat. Not all vehicles are equipped with this system. SEAT OCCUPANCY SENSOR PAD

Front passenger seat cushion is equipped with a foil contact sensor. If front passenger seat is occupied, seat occupancy detector will send a varying analog signal to the SBE. This signal varies in direct proportion to the weight or movement of seat occupant. Not all vehicles are equipped with this system. SRS CONTROL UNIT (SRS DIAGNOSTIC UNIT)

AIR BAG RESTRAINT SYSTEM Article Text (p. 4) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

The SRS control unit is located under center console, behind ventilation grill. SRS control unit contains an internal safety sensor. If SRS control unit safety sensor senses an impact, it applies voltage to the air bags. The SRS control unit also features a selfdiagnostic system that monitors the SRS for faults. If a fault is detected, a code sets in SRS control unit memory. SRS WARNING LIGHT

When ignition is turned on, SRS warning light illuminates with other instrument panel lights. If no faults are sensed in the SRS, the warning light will go out after about 6-10 seconds with engine off, or go out immediately when engine is started. If SRS warning light remains on, this indicates a fault in SRS. When vehicle is moving, SRS control unit informs driver of any faults in SRS by flashing SRS warning light for 5 minutes. After 5 minutes, the SRS warning light will remain on until fault is repaired and SRS control unit defect fault code memory is cleared. If SRS warning light fails to illuminate when ignition switch is turned on, this indicates bulb is faulty and/or wire circuit to bulb is shorted to ground. VOLTAGE TRANSFORMER

Voltage transformer is an integral part of SRS control unit. Voltage transformer boosts SRS power supply voltage to 35 volts to ignite gas generator pellets in air bag module. WIRING HARNESS

For easy identification, SRS wiring harness is Orange in color. SRS wiring harness is not repairable. It must be replaced if faulty. SERVICING

Look at date specified on SRS label attached to glove box door. This date indicates when the SRS must be serviced. Servicing consists of thoroughly inspecting all SRS components and performing a SYSTEM OPERATION CHECK. SYSTEM OPERATION CHECK

Turn ignition switch to ON position. If SRS warning light does not come on, SRS warning light bulb or circuit is faulty. If SRS warning light comes on and then goes out after about 6 seconds, SRS is okay at this time. If SRS warning light does not respond as specified, SRS is malfunctioning and must be repaired. SERVICE PRECAUTIONS

AIR BAG RESTRAINT SYSTEM Article Text (p. 5) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

Observe these precautions when working on SRS: * * * *

* *

* *

* * *

When working around steering column and before any repairs are performed, disable SRS. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. Always ensure radio is off before disconnecting battery. This will prevent damage to radio microprocessor. Before straightening damaged metal or arc-welding, disable SRS and disconnect front sensors. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. After disabling SRS, wait at least 5 minutes before servicing vehicle. SRS control unit maintains SRS voltage for about 5 minutes after system is disabled. Servicing SRS before 5 minutes may cause accidental air bag deployment and possible personal injury. Always wear safety glasses and gloves when handling a deployed air bag module. Air bag module may contain sodium hydroxide deposits, which irritates skin. Handle sensors carefully. Never strike or jar sensors. All sensors and mounting bracket bolts must be tightened to specification to ensure proper sensor operation. See TORQUE SPECIFICATIONS. Never use any SRS component that has been dropped from 2 feet or higher. To avoid air bag deployment when trouble shooting SRS, DO NOT use self-powered electrical test equipment, such as batterypowered or AC-powered voltmeter, ohmmeter, etc. DO NOT repair any part of SRS wiring harness. Always handle air bag module with trim cover away from your body. Always place air bag module on workbench with trim cover up, away from loose objects. Never expose SRS components to temperatures greater than 167°F (75°C). Never expose any SRS system components to cleaning agents such as solvents, gasoline, lye, etc.

DISABLING & ACTIVATING AIR BAG SYSTEM

WARNING: After disabling system, wait at least 5 minutes before servicing vehicle. Energy capacitor in SRS control unit maintains system voltage for about 5 minutes after system is disabled. Servicing system before 5 minutes may cause accidental air bag deployment and possible personal injury. Disabling System 1) Before proceeding, see SERVICE PRECAUTIONS. Retrieve fault codes before disconnecting battery. Ensure that ignition is off. Disconnect and shield the negative battery cable. Wait at least 5 minutes for energy capacitor in the SRS control unit to discharge. 2) Remove steering column lower casing cover. See Fig. 1. Remove Orange SRS connector from its holder on steering column.

AIR BAG RESTRAINT SYSTEM Article Text (p. 6) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

Disconnect Orange SRS connector. Remove glove box and disconnect both Orange SRS connectors from passenger-side air bag module. System is now disabled.

Fig. 1: Locating Steering Column Orange SRS Connector Courtesy of BMW of North America Activating System 1) Ensure ignition switch is in OFF position. Reconnect all Orange SRS connectors that were disconnected. Position Orange SRS connector back into holder on steering column. Place Orange SRS connectors back into position near passenger air bag module. Install glove box. 2) Install steering column lower casing cover. Connect negative battery cable. System is now activated. Perform system operation check to ensure system is functioning properly and no fault codes are set. See SYSTEM OPERATION CHECK. DISPOSAL PROCEDURES

* PLEASE READ THIS FIRST *

WARNING: Air bag module and ETR unit must be deployed before disposal. Disposing of undeployed components may violate federal, state and/or local laws. This also applies to vehicles that are to be scrapped. DEPLOYED AIR BAG MODULE & ETR UNIT

Deployed air bag modules and ETR units are not classified as hazardous material; dispose of them like any other part.

AIR BAG RESTRAINT SYSTEM Article Text (p. 7) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

ON-VEHICLE DEPLOYMENT (SCRAPPED VEHICLES ONLY)

WARNING: If components will not deploy using the following procedures, contact vehicle manufacturer for disposal instructions. Driver-Side Air Bag 1) Before proceeding, follow service precautions. See SERVICE PRECAUTIONS. Move vehicle outdoors to a remote area, away from workshop and people. Disconnect and shield negative battery cable. Close all windows and doors. Ensure air bag module is securely installed on steering wheel. Remove loose objects from front seat. 2) Disconnect connector from SRS control unit. SRS control unit is located underneath and between rear seats. Attach Igniter (62 1 270) and Cable (62 1 210) to 30-pin connector or 50-pin connector with Cable (62 1 310). Connect igniter to 12-volt battery placed 33 ft. (10 m) from vehicle. 3) Move away from vehicle, preferably standing in front, as far as igniter leads reach. Press igniter switch to deploy air bags and pretensioners. If Cable (62 1 310, 50-pin connector) is used, only air bags and pretensioner on one side of vehicle will deploy. To deploy remaining air bags and pretensioner, connect cable to free connector and repeat this step. UNDEPLOYED AIR BAG - FAULTY UNIT

If diagnostic testing and deploying procedures indicate air bag module and/or ETR is faulty, DO NOT dispose of in usual manner. Contact vehicle manufacturer for proper disposal instructions. OFF-VEHICLE DEPLOYMENT

Contact manufacturer for specific instructions. POST-COLLISION INSPECTION

When a vehicle has been involved in a collision, certain components of the passive restraint system must be inspected or replaced. See PASSIVE RESTRAINT SYSTEM INSPECTION article in the GENERAL INFORMATION section for post-collision inspection information.

REMOVAL & INSTALLATION

* PLEASE READ THIS FIRST *

WARNING: Failure to follow service precautions may result in air bag deployment and personal injury. See SERVICE PRECAUTIONS. After component replacement, ensure proper system operation. See SYSTEM OPERATION CHECK. CONTACT RING

AIR BAG RESTRAINT SYSTEM Article Text (p. 8) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

Removal Before proceeding, follow air bag service precautions. See SERVICE PRECAUTIONS. Disable air bag system. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. Remove air bag module. See DRIVER-SIDE AIR BAG MODULE. Remove steering wheel. See procedures under STEERING WHEEL. Remove contact ring cover and ground wire screw. Remove mounting screws and contact ring. See Fig. 2.

Fig. 2: Removing Contact Ring From Steering Wheel Courtesy of BMW of North America, Inc. Installation If installing original contact ring, center contact ring before installation. See CONTACT RING under ADJUSTMENTS. If installing new contact ring, new contact ring is held in center position with

AIR BAG RESTRAINT SYSTEM Article Text (p. 9) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

shipping lock pin. DO NOT remove lock pin until contact ring is attached to steering wheel. Install contact ring and reinstall screws holding ring to wheel hub. Pinch ends of locking pin with a pliers and remove. Reverse remainder of removal procedure and ensure system is functioning properly. See SYSTEM OPERATION CHECK. DRIVER-SIDE AIR BAG MODULE

Removal & Installation 1) Before proceeding, follow air bag service precautions. See SERVICE PRECAUTIONS. Disable air bag system. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. 2) Using Torx TX30 bit with long shank, remove air bag module Torx screws from rear of steering wheel. Lift up air bag module to disconnect wiring connector from rear of module. Put air bag module in a secure area with trim pad (air bag) facing upward. See Fig. 3. 3) To install, reverse removal procedure. Tighten air bag module Torx screws to specification. Activate air bag system. Perform system operation check to ensure system is functioning properly. See SYSTEM OPERATION CHECK.

Fig. 3: Removing Driver-Side Air Bag Module Courtesy of BMW of North America, Inc. PASSENGER-SIDE AIR BAG MODULE

Removal & Installation 1) Before proceeding, follow air bag service precautions. See SERVICE PRECAUTIONS. Disable air bag system. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. 2) Lift air bag cover away from top of instrument panel. For ease of removal, insert plastic wedges in both sides of detents for

AIR BAG RESTRAINT SYSTEM Article Text (p. 10) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

instrument panel. Remove 4 air bag module retaining bolts/nuts and remove air bag module from instrument. Disconnect Orange SRS harness connector from passenger air bag module. 3) To install, reverse removal procedure. Be careful not to pinch wiring harness. Front cover lugs must locate in recesses of instrument panel. Install and tighten screws to specification. See TORQUE SPECIFICATIONS. Activate air bag system. Perform system operation check to ensure system is functioning properly. See SYSTEM OPERATION CHECK. SIDE AIR BAG MODULE

Removal & Installation 1) Before proceeding, follow air bag service precautions. See SERVICE PRECAUTIONS. Disable air bag system. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. 2) Remove appropriate front door trim panel. Disconnect side air bag module electrical connector. Remove and discard side air bag mounting screws. 3) To install, reverse removal procedure. Use NEW microencapsulated mounting screws and tighten to specification. See TORQUE SPECIFICATIONS. Activate air bag system. Perform system operation check to ensure system is functioning properly. See SYSTEM OPERATION CHECK. EMERGENCY TENSIONING RETRACTOR (ETR) SEAT BELT

Information is not available. ENERGY CAPACITOR

Removal & Installation 1) Before proceeding, see SERVICE PRECAUTIONS. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM. Remove SRS control unit. See SRS CONTROL UNIT. 2) Using a .008" (0.20 mm) feeler gauge or a very small screwdriver, pry small cover from SRS control unit to expose energy capacitor. See Fig. 4. Remove 3 screws securing energy capacitor. Remove energy capacitor. 3) To install, reverse removal procedure. Clean all contacts and install energy capacitor and cover. Install SRS control unit. Activate air bag system. Perform system operation check to ensure system is functioning properly. See SYSTEM OPERATION CHECK.

AIR BAG RESTRAINT SYSTEM Article Text (p. 11) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

Fig. 4: Removing Energy Capacitor From SRS Control Unit Courtesy of BMW of North America, Inc. SEAT BELT CONTACTS

Removal & Installation Switches are located in seat belt latch assemblies. No other information is available. SIDE IMPACT HEAD PROTECTION SYSTEM (HPS)

AIR BAG RESTRAINT SYSTEM Article Text (p. 12) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

Removal & Installation 1) Before proceeding, see SERVICE PRECAUTIONS. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM. Remove grab handles. Remove trim from both front ("A") pillars. Remove trim from both center ("B") pillars and suspend on shoulder belt. Remove trim from both rear ("C") pillars. Remove rear seat. 2) Remove sun visors, mirror lights and interior light assembly. Position front seatbacks as flat as possible. Pull headliner upwards out of sheet metal tabs then, pull towards right rear door to remove. 3) Remove appropriate kick panel. Disconnect HPS gas generator electrical connector. Remove bolt securing gas generator with bracket to side cowl and remove gas generator. Gas generator is located on cowl just below window sill. 4) Remove front "A"-pillar retaining screw securing HPS tether to "A"-pillar. See Fig. 5. Remove bottom "A"-pillar bracket retaining screw and remove bracket from keyed slot. Remove top "A"pillar bracket retaining screw and remove bracket from keyed slot. 5) Remove HPS air bag from under front grab handle bracket. Be careful not to damage air bag. Remove "B"-pillar bracket retaining screw and remove bracket from keyed slot. Remove rear grab handle bracket. Remove rear retaining screw securing HPS tether to roof. Remove air bag assembly. 6) To install, reverse removal procedure. Ensure HPS air bag does not contact any sharp edges either on body or on clips. Activate air bag system. Perform system operation check to ensure system is functioning properly. See SYSTEM OPERATION CHECK.

Fig. 5: Side Impact Head Protection System Retaining Elements Courtesy of BMW of North America, Inc.

AIR BAG RESTRAINT SYSTEM Article Text (p. 13) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

SRS CONTROL UNIT

Removal & Installation 1) Before proceeding, see SERVICE PRECAUTIONS. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM. The SRS control unit is located under center console, behind ventilation grill. 2) Press upward on ventilation grill, then lift can holder out from side and remove. Slide ventilation grill downward and remove. Remove SRS control unit mounting nuts. Disconnect SRS control unit harness connector and remove control unit. 3) To install, reverse removal procedure. Ensure ground lead is installed on control unit mounting stud. Activate air bag system. If installing a new SRS control unit, it must be re-encoded. Perform system operation check to ensure system is functioning properly. See SYSTEM OPERATION CHECK. STEERING WHEEL

Removal 1) Before proceeding, follow air bag service precautions. See SERVICE PRECAUTIONS. Disable air bag system. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. 2) Remove air bag module. See DRIVER-SIDE AIR BAG MODULE. Ensure front wheels are in straight-ahead position. Remove steering wheel hub nut. Note how spring/clip lock is holding contact ring in center position. See Fig. 6. Mark steering wheel hub in relation to steering shaft for installation reference. 3) Unlock spring/clip lock before pulling off steering wheel by prying spring/clip lock out with small blade screwdriver. Pull steering wheel off by hand, or if necessary, use appropriate steering wheel puller. Carefully guide contact ring wiring up through steering column, while removing steering wheel/contact ring.

Fig. 6: Holding Contact Ring In Center Position Courtesy of BMW of North America, Inc.

AIR BAG RESTRAINT SYSTEM Article Text (p. 14) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

Installation 1) Viewing bottom of steering wheel, if contact ring is not centered (arrows do not line up), adjust contact ring before completing steering wheel installation. See CONTACT RING under ADJUSTMENTS. 2) Guide contact ring wiring down through column. Position steering wheel onto shaft splines using reference mark for realignment positioning. At same time, accurately align column locking pins into opening in contact ring on bottom of steering wheel. 3) Install and tighten steering wheel hub nut to specification. See TORQUE SPECIFICATIONS. Connect horn wiring. Install air bag module. Activate air bag system. Ensure system is functioning properly. See SYSTEM OPERATION CHECK. ADJUSTMENTS

CONTACT RING

Ensure front wheels are in straight-ahead position. Press down spring clip lock in steering wheel hub center and hold clip lock down. See Fig. 7. On bottom side of steering wheel, turn contact ring all the way either clockwise or counterclockwise until it stops. Turn contact ring back about 3 turns until arrows align. Release spring clip lock. Contact ring is now in center position.

Fig. 7: Adjusting Contact Ring Courtesy of BMW of North America, Inc. WIRE REPAIR

DO NOT repair SRS wiring or harness connectors. If SRS wiring or harness connectors are faulty, replace complete Orange SRS wiring harness.

AIR BAG RESTRAINT SYSTEM Article Text (p. 15) 1998 BMW 528i For Cise Electronica Gral. Jose M. Bustillo 3243 Capital Federal Buenos Aires 1406 Copyright © 1998 Mitchell Repair Information Company, LLC Tuesday, August 13, 2002 11:20PM

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS -----------------------------------------------------------Application Ft. Lbs. (N.m) Steering Wheel Hub Nut

...........................

58 (80)

INCH Lbs. (N.m) Driver-Side Air Bag Module Torx Screw ............. 70 Emergency Tensioning Retractor (ETR) Bolt ............ Passenger-Side Air Bag Unit Nut/Bolt ................. Side Air Bag Module Screw ............................ SRS Control Unit Bolt ................................

(8) (1) (1) (1) (1)

(1) - Information is not available. -----------------------------------------------------------DIAGNOSIS & TESTING

* PLEASE READ THIS FIRST *

WARNING: Always follow air bag service precautions to avoid air bag deployment and possible personal injury. See SERVICE PRECAUTIONS. After component replacement, ensure proper system operation. See SYSTEM OPERATION CHECK. SELF-DIAGNOSTIC SYSTEM

The SRS is monitored by diagnostic unit. Diagnostic unit monitors critical circuits within SRS. Circuits have a corresponding fault code. Diagnosis of the system requires the use of BMW service tester for SRS or equivalent Scan Tool. Faults displayed when performing a fault survey on SRS are shown in either permanent or sporadic status based on status at time fault survey is performed. Follow equipment manufacturers instructions for retrieval, repair and clearing of fault codes. WIRING DIAGRAMS

Information is not available. END OF ARTICLE