MODELS   221.0 /1

N2/7 Restraint systems control unit Location The restraint systems control unit is located below the COMAND control unit (A40/3) on the center tunnel.
		P91.60-3100-04

Task The restraint systems control unit is used to ensure passive occupant protection. If an accident occurs, the restraint systems control unit activates the restraint systems. These include the airbags, emergency tensioning retractors, and the buckle emergency tensioning retractors. The restraint systems control unit has self-monitoring and fault monitoring features. Head-on, rear-end, and side impact collisions are recorded, and a distinction is made between the different types of collision. Roll-overs around the longitudinal vehicle axis can also be detected. Scope of task Collision recognition and ignition timing determination. Ignition stage triggering when collision occurs Monitoring the seat occupied and automatic child seat recognition of the front passenger seat. Storing non-volatile crash telegrams.

Voltage supply of the connected sensors (B48/1, B48/2, B48/7, B48/8, B48/9, B48/10), the front passenger seat occupied and child seat recognition sensor (B48) (not ), the airbag system driver assist (B48/5), and the airbag system front passenger assist (B48/6). Capacitor in the event of battery disconnection if a collision occurs. Self-testing and permanent monitoring of system and fault display with non-volatile storage of faults and down times. Fault output via diagnosis communication. System readiness display via chassis CAN to the instrument cluster (A1) and to the upper control panel control unit (N72/1). Evaluation of integrated rollover sensor. Support of the automatic seat belt reminder warning via the chassis CAN. Output of the signal for transmitting an emergency call via the chassis CAN (only ).

Discrete inputs Circuit 31 Circuit 30 Circuit 15R Front passenger seat occupied and child seat recognition sensor (B48) (not ) Driver-side frontal acceleration sensor (B48/1) Passenger-side frontal acceleration sensor (B48/2) Airbag system driver assist (B48/5) Airbag system front passenger assist (B48/6) Driver door pressure sensor (B48/7) Front passenger door pressure sensor (B48/8) Rear door pressure sensor, driver-side (B48/9) Rear door pressure sensor, passenger-side (B48/10) Driver seat belt buckle and seat belt warning switch (S68/1) Front passenger seat belt buckle and seat belt warning switch (S68/2)

Discrete outputs Front passenger airbag squib 1 (R12/4) Passenger airbag squib 2 (R12/5) Left rear ETR squib (R12/6) Right rear ETR squib (R12/7) Driver airbag squib 1 (R12/13) Driver airbag squib 2 (R12/14) Front left sidebag squib (R12/20) Front right side air bag squib (R12/21) Left rear windowbag squib (R12/22) Right rear windowbag squib (R12/23) Drive buckle ETR squib (R46) Front passenger buckle ETR squib (R46/1) Digital crash output of the emergency call system control unit (N123/4) (only )