General safety rules (Audi A4 B8)

Inspection, installation and repair work may only be performed by trained specialists. For airbags. replacement intervals are not provided. Never use a test lamp, voltmeter or ohmmeter for testing. Pyrotechnic parts may only be tested in the installed state using a diagnostic system approved by the manufacturer. When performing work on pyrotechnic components and on the airbag control unit. "J234" battery ground wire must be disconnected with the ignition ON. Then close the negative terminal. After disconnecting the battery, wait 10 seconds. Reconnect the battery with the ignition ON. If after reconnecting the battery the ignition is not turned on - the control lamps in the instrument cluster do not light - until the ignition is turned on for the first time, keep your head and hands away from the steering wheel and knee airbag (if available), to avoid being in the area of the airbag and seat belts. Observe precautions after connecting the battery. Before performing work on pyrotechnic components of the system. laying and tensioning of seat belts, for example, by disconnecting the electric. plug connection, the mechanic must remove static charge from himself. Electrostatic charge is discharged by touching grounded metal elements, such as briefly touching a door lock. After contact with the activated pyrotechnic parts of the system. laying and tensioning seat belts. it is necessary to wash your hands. Pyrotechnic components are not permitted to be opened or repaired; it is essential to use only new units (risk of injury). It is prohibited to install pyrotechnic parts that are damaged or that have fallen onto a hard surface. When connecting pyrotechnic parts of the system. laying and tensioning seat belts. only the mechanic working on them should be inside the car.



Special instructions for seat belt tensioners: Handle the seat belt tensioner modules with extreme care. when removing and installing. If the seat belt tensioner modules are handled incorrectly,. there is a high risk of injury. Seat belt pretensioners. with mechanical damage (chips, cracks) are subject to mandatory replacement. The open end of the pretensioner must never be pointed towards people. When connecting the seat belt tensioner module. all mechanical parts, including the 3-point seat belt components, must be properly secured. If the seat belt tensioner module connection is. impossible due to limited mounting. space, you should completely rewind the seat belt. before installation. This will reduce the risk if further safety instructions are followed. These instructions primarily include disconnecting the battery and having the mechanic discharge any electrostatic charge before connecting the seat belt tensioner module. Depending on the force of the impact, the seat belt tensioner. the tension limiter may work, but it does not. These components should be treated as if they were non-working components!

Accident without airbag deployment

If the airbag warning light is on. "K75" does not indicate a malfunction, so the pyrotechnic components of the airbags do not need to be replaced. not required. Conduct a separate check of the seat belts.

Seat belts. and attachment points