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Volkswagen Golf Service & Repair Manual: Renewing pyrotechnic, electrical and mechanical components of the restraint system after an accident

Volkswagen Golf Service & Repair Manual / General body repairs, interior / Technical data / Safety information / Renewing pyrotechnic, electrical and mechanical components of the restraint system after an accident

Special tools and workshop equipment required
  Vehicle diagnostic tester
  Note
  •   The airbag control unit can be used for up to 2 side airbag and/or belt tensioner deployments with the airbag generation 8.* »not 8.R«.
  •   The airbag control unit can be used for up to 2 deployments of side airbag/driver airbag/front passenger airbag and/or belt tensioner with the airbag generation 9.*, 10.* and 8.R.
  •   After the third deployment, the error message “Control unit faulty” is displayed.
The airbag control unit must be renewed:
  •   In the event of a driver/front passenger airbag deployment “though not for airbag generation 9.*, 10.* and 8.R ” → Anchor
  •   After 3 deployments of side airbag/driver airbag/front passenger airbag and/or belt tensioner
  •   In the event of damage to the housing
  •   In the event of a deformation to the tunnel within a 200 mm radius of the control unit
Always renew the following:
  •   All triggered airbag units.
  •   Battery isolation igniter -N253-
Additionally, in the event of the front passenger airbag being triggered:
  •   Dash panel
  •   Supports of front passenger airbag unit which have been bent out of shape (must not be bent back into shape)
  •   All sensors for front airbag at front end
  •   Remaining sensors for lateral acceleration in event of deformation of attachment points in vicinity of sensors
Additionally, in the event of the driver airbag being triggered:
  •   Return spring with slip ring
  •   All sensors for front airbag at front end
  •   Remaining sensors for lateral acceleration in event of deformation of attachment points in vicinity of sensors
Additionally, in the event of the side airbag being triggered:
  •   Pressure sensors on the triggered side
  •   Lateral acceleration sensors on the side affected
  •   Seat cover
  •   Padding
  •   In case of foldable backrest: side padding (if fitted)
  •   Remaining sensors for lateral acceleration in event of deformation of attachment points in vicinity of sensors
Additionally:
  •   All belt inertia reels with triggered belt tensioners
  •   All belt inertia reels with triggered belt tensioners
  •   Belt buckles for all belt inertia reels with triggered belt tensioners and seat belt engaged
  •   Belt height adjuster (mechanical and electrical) for all belt inertia reels with triggered belt tensioners and seat belt engaged
–  If you suspect that belt tensioners or belt force limiters have been triggered, connect a vehicle diagnostic tester.
–  Under “15 - Airbag” in »Guided Fault Finding« check whether there is a crash entry logged for the airbag control unit.
–  At the same time check whether the “Resistance too high” fault is also logged for belt tensioners and/or belt force limiters. Triggered belt tensioners and/or belt force limiters have to meet both conditions. “Prerequisite: The airbag control unit has not yet been renewed”.
  Note
  •   The “Resistance too high” fault can also be logged in the event of a cable break. Under normal circumstances, no crash entry is then logged.
  •   Depending on the crash intensity, it is possible that the belt tensioner was triggered but »NOT« the belt force limiter. Observe notes on disposal of pyrotechnic components → Chapter.
  •   In addition, note the section: Checking seat belts → Chapter.
   
  Deployed belt force limiters can be identified by the following features:
  The pin -1- and lug -3- have popped out of the belt force limiter housing on the belt inertia reel.
  The strap -2- is no longer vertical but is pointing diagonally outwards.
–  If parts of the belt system are removed because of an accident, the belt system bolts must be renewed.
–  In addition, the following must also be replaced if necessary (visual check): all damaged components.
–  After renewing the airbag units or the control unit, affix stickers (only tear-off strips) to the registration card and return the registration card to the responsible Sales Centre or to the Importer for registration.
   

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