Safety belt Pre-tensioning device (UPN)
The UPN (10) seat belts are installed behind the trim of the middle pillars of the passenger compartment. With a double front passenger seat UPN (13), the seat belt of the middle passenger is located in the seat itself.
VN 10.011
6. Seat belt pretensioner unit; 7. Middle passenger seat belt pretensioner; 8. Driver's seat belt pretensioner igniter ETR (GUS) R12/1; 9. Squib pretensioner seat belt ETR (GUS) front passenger ETR (GUS) R12/2; 10. Squib pretensioner seat belt ETR (GUS) front middle passenger ETR(GUS) R12/34
(Publication taken from an online resource: «mercedesman.ru»)