Rear end collision, function - GF91.60-P-2004GZ

MODEL 164

Fig 1: Identifying Rear End Collision, Function (1 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Sequence of emergency tensioning retractor activities and the NECK-PRO head restraints in the event of a rear end collision for the driver and passenger-sides

Fig 2: Identifying Rear End Collision, Function (2 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

If the restraint systems control unit (N2/7) registers high vehicle acceleration and deceleration as a consequence of a rear end collision, a trigger pulse is issued to the following components:

Driver ETR [GUS] squib (R12/1)
Passenger ETR squib (R12/2)
Left 2nd row ETR [GUS] squib (R12/6)
Right 2nd row ETR [GUS] squib (R12/7)
Left 3rd seat row emergency tensioning retractor squibs (R12/35)
Right 3rd seat row emergency tensioning retractor squibs (R12/36)

If the seat belt on the driver or passenger side is not engaged in the seat belt buckle, then this fact is registered by the restraint systems control unit.

Registration is performed via the driver seat belt buckle and seat belt warning switch (S68/1) or via the front passenger seat belt buckle and seat belt warning switch (S68/2) and does not trigger the corresponding driver ETR [GUS] squib or the front passenger ETR [GUS] squib.

Seat belt buckle scan up to production period 31.05.06

If the driver seat belt buckle and seat belt warning switch, front passenger seat belt buckle and seat belt warning switch, left rear seat belt buckle switch (S68/11) and right rear seat belt buckle switch (S68/12), left 3rd seat row seat belt buckle switch (S68/16) (model 164.8) and right 3rd seat row seat belt buckle switch (S68/17) (model 164.8) signal that a seat belt has not been engaged, then the respective emergency tensioning retractors are not triggered by the restraint systems control unit.

Seat belt buckle scan as of production period 01.06.06

If the driver seat belt buckle and seat belt warning switch, front passenger seat belt buckle and seat belt warning switch signal that a seat belt has not been engaged, then the respective emergency tensioning retractors are not triggered by the restraint systems control unit.

There is no seat belt buckle scan for the 2nd seat row at left/right and seat belt buckle scan for the 3rd seat row at left/right (model 164.8). The emergency tensioning retractors for the 2nd and 3rd seat rows are triggered if the latch plate is not inserted.

Only for USA version, code 494

There is no seat belt buckle scan for the left and right rear seats, this means that the left and right rear ETR squibs are always deployed.

In the event of a collision and if the corresponding triggering threshold is exceeded, then a signal is additionally sent from the restraint systems control unit to the emergency call system control unit (N123/4) and an automatic emergency call is made.

Front emergency tensioning retractor component description		GF91.60-P-4042GZ
Rear emergency tensioning retractor component description		GF91.60-P-4043GZ
Seat belt buckle switch, component description		GF91.60-P-4045GZ
Restraint systems control unit, component description		GF91.60-P-4048GZ
Reversible belt emergency tensioning retractor, component description		GF91.60-P-4050GZ
Driver/passenger-side NECK-PRO head restraints		GF91.60-P-4053GZ
Rear seat belt buckle switch component description	Model 164.1 except USA version, code 494, up to production period 31.05.06	GF91.60-P-4054GZ
3rd seat row emergency tensioning retractor, component description	Model 164.8	GF91.60-P-4063GY