Airbag Units, Removing and Installing After an Accident

Airbag Units, Removing and Installing After an Accident

Special tools, testers and auxiliary items required

• Use a suitable vehicle tester such as the (VAS 5051B).





• Airbag control module with airbag generation 8.* not 8.R can be used for up to two side airbag, side curtain airbag and/or belt tensioner deployments.

• Airbag control module can be used with airbag generation 9.* and 9.R for up to two side airbag, side curtain airbag, driver's airbag, passenger's airbag and/or belt tensioner deployments.

• After the third deployment, the malfunction display "Control module defect" appears.

Airbag control module must be replaced:

• With a driver's, passenger's airbag deployment "however not with airbag generation 9.* and 8.R".

• After three side airbag, side curtain airbag, driver's airbag, passenger's airbag or belt tensioner deployments

• If housing is damaged

• If there is deformation on tunnel in 200 mm circumference around control module

Always replace the following:

• All deployed airbag units

• The Battery Switch-Off Relay (J655) or Battery Interrupt Igniter (N253) (equipment versions)

Also with passenger airbag deployment:

• Instrument Panel

• Deformed passenger module supports (cannot be reformed)

• All sensors for front airbag on front end

• Remaining cross acceleration sensors if anchorage point is deformed in sensor region

Also with driver airbag deployment:

• Coil connector with slip ring

• All sensors for front airbag on front end

• Remaining cross acceleration sensors if anchorage point is deformed in sensor region

Also with side airbag deployment:

• Pressure sensors on deployed side

• Cross acceleration sensors on deployed side

• Cover

• Cushion

• With a folding rear seat backrest: side cushion (if equipped)

• Remaining cross acceleration sensors if anchorage point is deformed in sensor region

Also with side curtain airbag deployment:

• Cross acceleration sensors on deployed side

• Trim on A-pillar, B-pillar, C-pillar, D-pillar

• Remaining cross acceleration sensors if anchorage point is deformed in sensor region

In addition:

• All belt retractors with deployed belt tensioners

• All belt retractors with deployed belt force limiters (depending on equipment)

- If belt tensioner and/or belt force limiter deployment is suspected, connect a suitable vehicle tester such as the (VAS 5051B).

- In Guided Fault Finding under "15 - Airbag", check whether there is a crash entry in the airbag control module.

- Check if the error "Resistance too high" is stored for the belt tensioner and/or belt force limiter. Deployed belt tensioners and/or belt force limiters must meet both criteria. "Requirement: the airbag control module must not have been replaced."

• The error "Resistance too high" may also be caused by an open circuit. If that is the case, there is usually no collision entry.

• Depending on the vehicle, the belt tensioner may be deployed while the belt force limiter may NOT. If that is the case, follow the guidelines for disposing of pyrotechnic components. Refer to => [ Pyrotechnic Belt Tensioner Disposal ] Pyrotechnic Belt Tensioner Disposal.

• Also check the seat belts. Refer to => [ Seat Belts, Inspecting ] Seat Belts, Inspecting.

If needed (visual inspection), the following must also be replaced: all faulty components.

After replacing airbag units or control module, affix stickers (only tear-off strips) to registration card and return registration card to relevant Sales Center or to Importer for registration.