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

Special tools and workshop equipment required 

• Vehicle Diagnostic Tester

TIP:

• The airbag control module can be used for up to two deployments of the side airbag and/or seat belt tensioner with airbag generation 8.* >>not 8.R<<.
• The airbag control module with airbag generation 9.*, 10.* and 8.R. can be used for up to two side, driver and front passenger airbag and/or belt tensioner deployments 
• After the third deployment, the malfunction indicator "Control module faulty" appears.

The airbag control module must be replaced:

• With driver and passenger airbag deployment "but not with airbag generation 9.*, 10.* and 8.R". Refer to RESTRAINT SYSTEM PYROTECHNIC, ELECTRIC AND MECHANICAL COMPONENTS, REPLACING AFTER A COLLISION => The airbag control module with airbag generation 9.*, 10.* and 8.R. can be used for up to two side, driver and front passenger airbag and/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 Interrupt Igniter -N253-

Also with front passenger airbag deployment:

• Instrument Panel
• Deformed front passenger module supports (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

Also with driver airbag deployment:

• 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

Also with thorax airbag deployment:

• Pressure sensors on the deployed side
• Transverse acceleration sensors on the deployed side
• Cover
• 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.

-- Also check if the "Resistance too high" error is stored for the belt tensioner and/or belt force limiter. Deployed belt tensioners and/or belt force limiters must fulfill both conditions. "Requirement: the airbag control module was not replaced yet".

TIP:

• The error message "Resistance Too High" may also be stored if there is an open circuit. Then there is normally no crash entry.
• Depending on the crash, the belt tensioner may have deployed while the belt force limiter did >>NOT<<. In that case, follow the disposal information for pyrotechnic components. Refer to AIRBAG, BELT TENSIONER AND BATTERY CUT-OUT UNITS, STORING, TRANSPORTING AND DISPOSING (PYROTECHNIC COMPONENTS) .
• Also check the seat belts. Refer to SEAT BELTS, CHECKING .

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

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