Restraint System Pyrotechnic, Electric And Mechanical Components, Replacing After A Collision

Special tools and workshop equipment required 

• Vehicle Diagnostic Tester

The Airbag Control Module -J234- must be replaced:

• If the display "Control module faulty" appears after checking the DTC memory
• After three side airbag, driver airbag, front passenger airbag or belt tensioner deployments.
• if housing is damaged
• if there is deformation on tunnel in 200 mm circumference around control module

Always exchange the following:

• All deployed airbag units

Additionally when the front passenger airbag is deployed:

• Instrument Panel
• Deformed supports of the front passenger airbag unit (cannot be reformed).
• All front airbag sensors on the front end
• Remaining transverse acceleration sensors if the mounting points are deformed in the sensor area

Additionally when the driver airbag is deployed:

• Return Spring with Slip Ring
• All front airbag sensors on the front end
• Remaining transverse acceleration sensors if the mounting points are deformed in the sensor area

Additionally when the thorax airbag is deployed:

• Pressure sensors on the deployed side
• Transverse acceleration sensors on the deployed side
• Backrest Cover
• Backrest Cushion
• With a folding rear seat backrest: side cushion (if equipped)
• Remaining transverse acceleration sensors if the mounting points are deformed in the sensor area

Also:

• All automatic belt retractors with deployed seat belt tensioners
• All automatic belt retractors with deployed seat belt force limiters (depending on vehicle equipment)
• Seat belt latches for all automatic belt retractors with deployed seat belt tensioners with the belt on
• Seat belt height adjuster (manual and power) for all automatic belt retractors with deployed seat belt tensioners with the belt on

-- Connect the Vehicle Diagnostic Tester if there is a chance the belt tensioner and/or seat belt force limiter deployed.

-- In >>Guided Fault Finding<< under "15 - Airbag", check whether there is a crash entry in the Airbag Control Module -J234-.

-- Check if the "Resistance too large" fault is stored at the same time for the seat belt tensioner and/or seat belt force limiter. Deployed belt tensioners and/or belt force limiters must fulfill both conditions. Requirement: the Airbag Control Module -J234- was not replaced yet.

TIP:

• The fault "Resistance Too High" may also be stored if there is an open circuit. Then there is normally no crash entry.
• Follow the seat belt inspection Refer to SEAT BELTS, CHECKING .

-- If parts of the seat belt system are removed due to an accident, replace the belt system bolts.

-- If necessary (visual inspection), additionally replace all faulty components.

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