Air Bag Restraint Systems Audi A4 B6

DESCRIPTION & OPERATION

The air bag restraint system is designed to provide increased protection for driver and passengers by deploying front air bags and front and rear seat belt pretensioners in front-end collision and head and side air bags when side impact is detected. The system is designed to be used with 3-point seat belts.

Main components of the system include driver-side air bag module, passenger-side air bag module, driver and passenger seat-mounted side air bag modules, left and right head air bag modules, front and rear seat belt pretensioners, air bag control module, front and side air bag impact (crash) sensors, data link connector, spiral spring assembly (under steering wheel, in steering column) and air bag malfunction indicator light. (Scheme 1)& (Scheme 2).

Air bag control module is capable of system self-diagnostics. Air bag system components are monitored electrically and any interferences in operation can be detected. These interferences (faults) are then stored in air bag control module memory. Air bag control module memory differentiates between types of faults. After diagnosis and servicing, fault memory can be erased.

COMPONENT LOCATIONS

Refer to illustration for restraint system component locations. (Scheme 1)& (Scheme 2).

Scheme 1

Scheme 2

SERVICING

Manufacturer recommends replacing main air bag system components (air bag modules, seat belt pretensioners, spiral spring and air bag control module) every 14 years. Replacement year and month appear on sticker located on driver-side B-pillar. Sticker must be updated when components are replaced.

On Cabriolet, test rollover protection system every 2 years regardless of mileage. Use Guided Fault Finding procedure contained in VAS 5051 tester to perform air bag control module output operation test.

SYSTEM OPERATION CHECK

Turn ignition switch to ON position. AIR BAG warning light should turn on for about 4 seconds, then turn off. If AIR BAG warning light remains on or does not turn on at any time, go to DIAGNOSTICS .

AIR BAG SAFETY PRECAUTIONS

Observe these precautions when working with air bag systems

1. Disable air bag system before servicing any part of system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system) .
2. DO NOT use test light, ohmmeter or voltmeter to test air bag system, except when testing spiral spring.
3. Use only Scan Tool (VAG 1551/1552), Vehicle Diagnostic, Testing and Information System (VAS 5051) or equivalent scan tool, with appropriate adapter to test air bag system.
4. DO NOT open, disassembled or repair air bag system components. Always use NEW components.
5. DO NOT use air bag system components that have been dropped from 20" (0.5 m) or higher. Replace air bag components that are mechanically damaged.
6. DO NOT leave undeployed air bag system components unattended. Install components in vehicle immediately after removing from packaging.
7. Ensure trim cover faces up when placing undeployed air bag modules on bench or other surface.
8. DO NOT allow chemical cleaners, oil, or grease to contact vinyl covering on air bag modules.
9. DO NOT expose air bag modules to temperatures greater than 212°F (100°C).
10. Use only original equipment seat covers designed for use with side air bags (identified by label on fabric).
11. Inspect A-, B-, C- and D-pillar trim panels for damage prior to installing head air bag. Replace any damaged trim panels. Never attempt to repair trim panels.
12. Remove entire head air bag module before performing any repairs behind it.
13. Always carry head air bag in folded position.

CENTERING SPIRAL SPRING

If spiral spring is twisted, it must be centered before installation. From central position, spiral spring must be able to turn approximately 3 1/2 turns in both directions.

DISABLING & ACTIVATING AIR BAG SYSTEM

Note. Obtain radio security code before disconnecting battery.

To disable air bag system, ensure ignition is off, then disconnect and shield negative battery cable. No waiting time is necessary after disconnecting battery. To activate air bag system, turn ignition on, ensure no one is in vehicle, then reconnect negative battery cable. Perform SYSTEM OPERATION CHECK .

DISPOSAL PROCEDURES

Note. Disposal of undeployed air bag may violate federal, state and/or local laws. If scrapping vehicle, air bags and pretensioners must be removed from vehicle and deployed. If air bag cannot be deployed, contact vehicle manufacturer for further instructions.

DEPLOYED AIR BAG OR PRETENSIONER

Wear gloves and safety glasses when handling deployed air bag modules and seat belt pretensioners. Seal deployed air bag modules and seat belt pretensioners in plastic bag and dispose of like any other part.

UNDEPLOYED AIR BAG OR PRETENSIONER-FAULTY UNIT

If an undeployed air bag module or seat belt pretensioner is diagnosed as faulty, remove faulty device and return intact to manufacturer for proper disposal. Device must be packaged and shipped according to U.S. Department of Transportation procedures. Retain replacement packaging including label. DO NOT deploy air bag or pretensioner.

SCRAPPED VEHICLE

Undeployed air bags and seat belt pretensioners must be removed and deployed before scrapping vehicle. Use Deployment Device (J-44210), and follow instructions in Air Bag & Pyrotechnic Deployment Device Instruction Booklet.

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 AIR BAG/SRS COMPONENT INSPECTION & REPLACEMENT TABLES article in the GENERAL INFORMATION section.

REMOVAL & INSTALLATION

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Remove center console rear ashtray. Remove center armrest nut through rear ashtray opening. Disconnect telephone harness connector, if equipped. Remove center armrest. Carefully pry off shift cover and disengage shifter boot securing frame. Under shifter boot, turn connecting collar clockwise until it disengages. Remove shifter knob.
2. Remove radio. Remove center console upper trim located above cup holder of front center console. Pull up firmly on parking brake lever. On models with automatic transmission, shift gear selector all the way rearward. On all models, on front inner footwell, remove covers and bolts from left and right side of center console. (Scheme 3)
3. Release parking brake. Detach parking brake lever trim plate. (Scheme 4) Pull up firmly on parking brake lever. Remove 2 bolts and parking brake lever carrier. Carefully pry up cover under parking brake lever. Remove 2 screws from under parking brake lever cover.
4. Remove 2 bolts and front ashtray. Remove storage compartment trim. Remove 2 bolts from front ashtray opening. Remove 4 bolts around selector mechanism securing center console. Remove 2 bolts from top of center console. Remove remaining nuts accessible through rear ashtray opening. Pull center console forcefully backwards. Disconnect cigarette lighter connector and navigation module connector, if equipped. Remove center console.
5. Disconnect air bag control module connector securing bracket and connector. Remove air bag control module bolts. Remove air bag control module. (Scheme 5)
6. To install, reverse removal procedure. Tighten air bag control module bolts and center console nuts and bolts specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system. Replacement air bag control modules must be coded. See «CODING AIR BAG CONTROL MODULE»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__coding-air-bag-control-module) under DIAGNOSTICS.

Scheme 3

Scheme 4

Scheme 5

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Center steering wheel.
2. Release steering wheel adjuster and pull steering wheel fully out and up. Turn steering wheel 90 degrees. Remove Torx T30 screw from back of steering wheel. (Scheme 6) Turn steering wheel 180 degrees (1/2 turn) and remove remaining Torx T30 screw from back of steering wheel. Tilt air bag module down and disconnect air bag module harness connector. Remove air bag module from vehicle.
3. To install, reverse removal procedure. Install and tighten air bag mounting screws by hand, then tighten to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 6

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Front air bag impact (crash) sensors are located inside front core support beside radiator. (Scheme 7)
2. Remove radiator fan air guides as necessary to gain access to front air bag impact sensors. Disengage tab and disconnect Yellow connector on impact sensors. Remove bolts and impact sensor.
3. To install, reverse removal procedure. Tighten impact sensor bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 7

Removal & Installation (Sedan)

1. Move seats up completely. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Head air bag modules are mounted behind headliner above side windows. (Scheme 1)
2. Remove bolts and sun visors. Remove bolts under A-pillar assist handle covers. Unclip rear air bag label (on B-pillar), and move it down. Unclip 3 clips at A-pillar and remove A-pillar trim panels. Pull lower seat belt anchor cover off. Push lower seat belt end fitting downward to remove.
3. Remove bolts under covers on D-pillar assist handles. Carefully pry off and remove roof trim panel, located at back of headliner. Unclip 3 clips at D-pillar and remove D-pillar trim panels. Remove door weatherstrip from B-pillar upper trim. Unclip 2 lower clips, 2 upper clips and slide B-pillar upper trim downward.
4. Remove rear seat assembly. See «REAR SEAT ASSEMBLY»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems). Remove 2 C-pillar trim panel bolts. (Scheme 8) Unclip bottom C-pillar and outer rear shelf clips and lift rear shelf up. Unclip remaining C-pillar clip and remove C-pillar trim panel from vehicle. On fixed seat back models, release third seat belt at bottom and wind it through.
5. Remove rear shelf speakers and sunshade, if equipped. From inside luggage compartment, remove bolts for rear shelf. Move rear shelf forward to disengage rear edge and remove from vehicle.
6. Disconnect appropriate head air bag harness connectors. Remove and discard 10 head air bag mounting bolts. (Scheme 9) Remove 3 brackets and place front section of head air bag module on seats. Remove and discard remaining 2 igniter mounting bolts. Remove head air bag module.
7. To install, reverse removal procedure. Fold head air bag module at roof-to-A-pillar transition when installing. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Removal & Installation (Wagon)

1. Move seat up completely. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Head air bag modules are mounted behind headliner above side windows. (Scheme 1)
2. Remove bolts and sun visors. Remove bolts under A-pillar assist handle covers. Unclip rear air bag label (on B-pillar), and move it down. Unclip 3 clips at A-pillar and remove A-pillar trim panels. Release 4 clips and remove roof end trim, located at back of headliner.
3. Press covering plate, in eyelet partition grille, to rear and remove bolt behind it. (Scheme 10) Remove rear seat assembly. See «REAR SEAT ASSEMBLY»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems). Release rear edge of luggage compartment side trim. Unclip clips at D-pillar and remove D-pillar trim panels.
4. Remove bolts under covers of rear door upper trim assist handles. Remove remaining bolts and rear door upper trim. Remove bolts and rear side window trim. Disconnect appropriate head air bag harness connectors.
5. Remove and discard 10 air bag mounting bolts. (Scheme 11) Remove 4 brackets and place front section of head air bag module on seats. Remove and discard remaining 3 igniter mounting bolts. Remove head air bag module.
6. To install, reverse removal procedure. Fold head air bag module at roof-to-A-pillar transition when installing. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 8

Scheme 9

Scheme 10

PASSENGER-SIDE AIR BAG MODULE (WAGON)

Note. Do not disconnect passenger-side air bag module at Red connector. Passenger-side air bag supports and instrument panel assembly must be replaced if air bag has deployed.

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Passenger-side air bag module is located in right side of instrument panel, above glove box. (Scheme 1)
2. Remove instrument panel right side cover. Open glove box. Remove 2 bolts behind side cover and 3 bolts inside top of glove box. Remove 2 bolts on right side lower undercover. Move glove box downward. Disconnect glove box light connector and harness connectors, if equipped. Remove glove box.
3. Disconnect air bag module connector. Remove brace behind air bag. Remove 4 nuts and passenger-side air bag module. (Scheme 12) Remove and discard air bag supports.
4. To install, reverse removal procedure. Tighten passenger-side air bag module nuts and bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 11

Removal & Installation (With Folding Seat Back)

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Lift forward edge of rear seat bench to release retainers. Remove side air bag connector from groove in bottom of rear seat bench and disconnect connector.
2. Fold both seat backs down. Remove clips from behind in direction of arrow. (Scheme 13) Remove bolts and clamps, then lift each seat back out of center supports. Remove jam nut with latch bolt, lower bolt and both seat side bolsters.
3. To install, reverse removal procedure. Tighten fasteners to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Removal & Installation (With Fixed Seat Back)

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Lift forward edge of rear seat bench to release retainers. Remove side air bag connector from groove in bottom of rear seat bench and disconnect connector.
2. Locate headrest lock mechanism at base of outer headrest post. Identify headrests as right and left. Press lock mechanism button and lift headrest up, out of seat back.
3. On models equipped with a ski sack, lever out ski sack frame, located in center of seat back. On all models, remove headrest guides. Disconnect side impact air bag connectors. Lift seat back up, and out of mounting holes. (Scheme 14)
4. To install, reverse removal procedure. Activate air bag system.

Scheme 12

Scheme 13

Removal & Installation (Front)

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system).
2. Remove appropriate A-pillar trim. Remove upper and lower B-pillar trim. Detach seat belt at lower attachment point and remove from guide. (Scheme 15) Remove bolt and seat belt pretensioner. Remove upper anchor bolt at top of belt height adjuster, then remove belt from belt height adjuster. Open Yellow retainer at Yellow/Blue connector and using screwdriver, disconnect seat belt pretensioner harness connector. Remove seat belt pretensioner.
3. To install, reverse removal procedure. Tighten seat belt and pretensioner bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Removal & Installation (Rear)

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Rear seat belt pretensioners are located on rear parcel shelf (area above and behind rear seats), under rear shelf (interior trim). (Scheme 2)
2. Remove bolts under covers on D-pillar assist handles. Carefully pry off and remove roof trim panel, located at back of headliner. Unclip 3 clips at D-pillar and remove D-pillar trim panels. Remove door weatherstrip from B-pillar upper trim. Unclip 2 lower clips, 2 upper clips and slide B-pillar upper trim downward.
3. Remove rear seat assembly. See «REAR SEAT ASSEMBLY»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems). Remove 2 C-pillar trim panel bolts. (Scheme 8) Unclip bottom C-pillar and outer rear shelf clips and lift rear shelf up. Unclip remaining C-pillar clip and remove C-pillar trim panel from vehicle. On fixed seat back models, release third seat belt at bottom and wind it through.
4. Remove rear shelf speakers and sunshade, if equipped. From inside luggage compartment, remove bolts for rear shelf. Move rear shelf forward to disengage rear edge and remove from vehicle.
5. Remove moisture shield. Remove luggage compartment side trim. From inside luggage compartment, remove seat belt pretensioner bolt. (Scheme 16)or (Scheme 17). Remove lower anchor bolt. Disconnect seat belt pretensioner connector. Remove seat belt pretensioner.
6. To install, reverse removal procedure. Tighten seat belt anchor bolt and pretensioner mounting bolt to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 14

Scheme 15

Scheme 16

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system).
2. Remove seat and lower B-pillar trim. Remove front seat belt pretensioner bolt, disconnect connector and lift pretensioner out of B-pillar. Inside B-pillar, remove lower foam piece. Remove impact (crash) sensor bolts. (Scheme 18) Lift up impact sensor, disengage tab and disconnect Yellow harness connector. Remove impact (crash) sensor.
3. To install, reverse removal procedure. Tighten side air bag impact (crash) sensor bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 17

1. Remove bolts under covers on D-pillar assist handles. Carefully pry off and remove roof trim panel, located at back of headliner. Unclip 3 clips at D-pillar and remove D-pillar trim panels. Remove door weatherstrip from B-pillar upper trim. Unclip 2 lower clips, 2 upper clips and slide B-pillar upper trim downward.
2. Remove rear seat assembly. See «REAR SEAT ASSEMBLY»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems). Remove 2 C-pillar trim panel bolts. (Scheme 8) Unclip bottom C-pillar and outer rear shelf clips and lift rear shelf up. Unclip remaining C-pillar clip and remove C-pillar trim panel from vehicle. On fixed seat back models, release third seat belt at bottom and wind it through.
3. Remove impact (crash) sensor bolts. (Scheme 19) Lift up impact sensor, disengage tab and disconnect Yellow harness connector. Remove impact (crash) sensor.
4. To install, reverse removal procedure. Tighten side air bag impact (crash) sensor bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 18

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system).
2. Remove appropriate seat. Remove backrest panel. Remove boot. (Scheme 20) Remove wiring harness upward. Remove and discard 2 side air bag nuts. Lever out metal strap. Remove side air bag module.
3. To install, reverse removal procedure. Use NEW air bag nuts provided with NEW air bag module. Ensure air bag wire harness does not rub on or is not damaged by moving parts. Tighten side air bag module nuts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 19

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system).
2. Remove rear seat. See «REAR SEAT ASSEMBLY»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems). On fixed seat back models, disconnect connector on wiring harness. (Scheme 21)
3. On folding seat back models, remove air bag connector from groove of rear seat upholstery, then disconnect air bag connector. (Scheme 22) Remove left and right side seat bolsters, if not already done. Cut cable tie and open cable channel. On all models, remove bolts and rear side air bag module.
4. To install, reverse removal procedure. Tighten rear side air bag module bolts to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications). Activate air bag system.

Scheme 20

Scheme 21

1. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system). Ensure front wheels are in straight-ahead position.
2. Adjust steering column to the fully out and down position. Remove steering wheel. See «STEERING WHEEL»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems). Remove screws and steering column covers. Disconnect spiral spring connectors. Release locking lugs and remove spiral spring. DO NOT turn or twist spiral spring after removal. (Scheme 23)
3. To install, reverse removal procedure. Ensure front wheels are in straight-ahead position. NEW spiral spring may have cable tie or shear ring which locks assembly in centered position, removed before installing new spiral spring. Center spiral spring if necessary. See «CENTERING SPIRAL SPRING»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__centering-spiral-spring) under ADJUSTMENTS. Activate air bag system.

Scheme 22

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__air-bag-safety-precautions) . Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__disabling-activating-air-bag-system) . Turn front wheels to straight-ahead position. Remove driver-side air bag module. See «DRIVER-SIDE AIR BAG MODULE»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems) . Remove steering wheel bolt. Disconnect harness connectors. Remove steering wheel.
2. To install, reverse removal procedure. Install NEW steering wheel bolt and tighten to specification. See «TORQUE SPECIFICATIONS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__torque-specifications) . Activate air bag system.

DIAGNOSTICS

Note. Although other scan tools are available, manufacturer recommends using Scan Tool (VAG 1551/1552) or Vehicle Diagnostic, Testing and Information System (VAS 5051) to access air bag system on-board diagnostics. The following procedures are designed for use with VAG 1551/1552 or VAS 5051.

CODING AIR BAG CONTROL MODULE

1. Connect Scan Tool (VAG 1551/1552), Vehicle Diagnostic, Testing and Information System (VAS 5051) or equivalent scan tool, with appropriate adapter, to 16-pin Data Link Connector (DLC) in lower left corner of instrument panel, to left of steering wheel. see scheme 24 If there is no display, check voltage supply to DLC.
2. Turn ignition ON. Press button "1" to select rapid data transfer. Press buttons "1" and "5" to select air bag code 15. Confirm input with "Q" button. Use right arrow to scroll forward through program. After approximately 5 seconds, RAPID DATA TRANSFER and SELECT FUNCTION will appear on display. Press buttons "0" and "7" to select "Code Air Bag Control Module" function 07. Confirm input with "Q" button. Enter air bag control module coding for correct vehicle configuration. See «AIR BAG CONTROL UNIT CODES»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems) table.
3. Confirm input with "Q" button. Press buttons "0" and "6" to select "End Output" function 06. Confirm input with "Q" button. Remove key from ignition. Repeat procedure to ensure correct coding. Check system for proper operation. See «SYSTEM OPERATION CHECK»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__system-operation-check).

AIR BAG CONTROL UNIT CODES

Scheme 23

CHECKING & ERASING DTC MEMORY

1. Connect Scan Tool (VAG 1551/1552), Vehicle Diagnostic, Testing and Information System (VAS 5051) or equivalent scan tool, with appropriate adapter, to 16-pin Data Link Connector (DLC) in lower left corner of instrument panel, to left of steering wheel. see scheme 24 If there is no display, check voltage supply to DLC.
2. Turn ignition ON. Press button "1" to select rapid data transfer. Press buttons "1" and "5" to select air bag code 15. Confirm input with "Q" button. Use right arrow to scroll forward through program. After approximately 5 seconds, RAPID DATA TRANSFER and SELECT FUNCTION will appear on display. Press buttons "0" and "2" to select "Check DTC Memory" function 02. Confirm input with "Q" button. Perform appropriate diagnostic test. See «DIAGNOSTIC TESTS»(/audi/a4/b6-2000-2006/remont/airbag/#air-bag-restraint-systems__diagnostic-tests).
3. Press buttons "0" and "5" to select "Erase DTC Memory" function 05. Confirm input with "Q" button. Intermittent malfunctions are indicated by "/SP" on right side of scan tool display. Press "Print" button for complete printout of scan tool operation. To conduct an automatic test sequence, enter "00" and confirm input with "Q" button.

DIAGNOSTIC TESTS

Information is not available.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Air Bag System Wiring Diagram (A4-1 Of 2). Scheme 24

Air Bag System Wiring Diagram (A4-2 Of 2). Scheme 25

Air Bag System Wiring Diagram (A4 Convertible-1 Of 2). Scheme 26

Air Bag System Wiring Diagram (A4 Convertible-2 Of 2). Scheme 27

See also:
• AIR BAG/SRS COMPONENT INSPECTION & REPLACEMENT TABLES
• AIR BAG SAFETY PRECAUTIONS
• DIAGNOSTICS
• DISABLING & ACTIVATING AIR BAG SYSTEM
• SYSTEM OPERATION CHECK
• TORQUE SPECIFICATIONS
• CODING AIR BAG CONTROL MODULE
• REAR SEAT ASSEMBLY
• CENTERING SPIRAL SPRING
• DIAGNOSTIC TESTS