Airbag Units, Removing and Installing After an Accident

Airbag Units, Removing and Installing After an Accident

Special tools, testers and auxiliary items required

• Suitable vehicle diagnostic tool, e.g. Vehicle Diagnosis, Testing and Information System (VAS 5051 A).





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

• 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:

• For a driver's / front passenger's side airbag deployment "however not with airbag generation 9.* and 8.R"

• After three side-, head-level- driver's side- front passenger's side 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

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

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

• Upholstery

• with foldable rear seat backrests: Side upholstery

• 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 seat belts with triggered belt tensioners

A - with deployed airbag control module

- Connect a suitable vehicle diagnostic tool, e.g. Vehicle Diagnosis, Testing and Information System (VAS 5051 A) and tap "15 - airbag" in vehicle system selection. Ignition must be switched on.

Front belt tensioner:

- Read measuring value block display group 001:

You can recognize deployed belt tensioners by display "too great ".





Rear belt tensioner (versions depending on equipment/country):

- Read measuring value block display group 002:

You can recognize deployed belt tensioners by display "too great ".

B - with replaced airbag control module:

- Connect a suitable vehicle diagnostic tool, e.g. Vehicle Diagnosis, Testing and Information System (VAS 5051 A) and tap "15 - airbag" in vehicle system selection. Ignition must be switched on.

- Retrieve DTC memory:

You can recognized deployed belt tensioners by malfunction message " Belt tensioner - resistance value too great".





• If needed (visual inspection), the following must also be replaced: All damaged 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.