Restraint System Components, Removing And Installing After An Accident
Special tools and workshop equipment required
- Vehicle Diagnosis Tester
The airbag control module can be used for up to 2 side airbag and/or belt tensioner deployments with airbag generation 8.*, except >>8.R<<.
The airbag control module can be used for up to two side, driver and passenger airbag and/or belt tensioner deployments with airbag generation 9.*, 10.* and 8.R.
After the third deployment, the malfunction display "Control module defect" appears.
Airbag control module must be replaced:
- With driver and passenger airbag deployment "but not with airbag generation 9.*, 10.* and 8.R" RESTRAINT SYSTEM COMPONENTS, REMOVING AND INSTALLING AFTER AN ACCIDENT
- After three side airbag, driver airbag, passenger 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 triggered airbag units
- The battery interrupt igniter -N253-
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
In addition:
- All belt retractors with deployed belt tensioners
- All belt retractors with deployed belt force limiters (depending on equipment)
- Seat belt latches for all automatic belt retractors with deployed seat belt tensioners
- Seat belt height adjuster (manual and power) for all automatic belt retractors with deployed seat belt tensioners
-- Connect the Vehicle Diagnosis 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.
-- Check if the malfunction "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 AIRBAG, BELT TENSIONER AND BATTERY CUT-OUT UNITS, STORAGE, TRANSPORTING AND DISPOSAL .
Also check the seat belts. Refer to SEAT BELTS, INSPECTING .
Deployed belt force limiters can be recognized by the following characteristics:
The pin -1- and tab -3- are protruding out of the belt force limiter housing on the automatic belt retractor.
The tab -2- is no longer vertical but is diagonal toward the outside.
-- 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.