Rear Impact

Model 140 Shown:

Triggering of the emergency tensioning retractor during a severe rear-end collision depends on the version of ETR control module with airbag (N2/2).

Control module manufacturer:
Bosch from beginning of production
Temic without side airbag as of 9/95
Temic with side airbag as of introduction of side airbag

The ETR control module with airbag (N2/2) evaluates the acceleration caused by the rear-end collision and upon exceeding a certain value triggers the squibs in the emergency tensioning retractors (R12/1, R12/2).

On USA vehicles a check is made whether the belts are fastened. If the seat belt is not fastened the emergency tensioning retractor is not triggered.

On vehicles with OSR (front passenger seat occupied recognition sensor) or ACSR (front passenger seat occupied recognition sensor with automatic child seat recognition) a check is made whether the passenger seat is occupied.

If the passenger seat is not occupied or a child seat not recognized the emergency tensioning retractor on the passenger side is not triggered.