Restraint systems control unit - task - GF91.60-P-4018-01T

The restraint systems control unit (N2/7) is used to ensure passive passenger compartment protection. If an accident occurs, the restraint systems control unit (N2/7) triggers the restraint system. This includes the airbags, emergency tensioning retractors, and the belt force limiters. The restraint systems control unit (N2/7) is self-monitoring and ensures the monitoring of faults. Head-on, rear-end, and side impact collisions are recorded, and a distinction is made between the different types of collision. Furthermore, a rollover can be recognized.

The restraint systems control unit (N2/7) has an integrated roll sensor.

Operations on or with the connected restraint systems control unit (N2/7) may only be performed if the transmitter key (A8/1) is removed, otherwise there is a danger that the airbag is triggered erroneously.

Task 

• Collision recognition and ignition time determination
• Ignition stage triggering when collision occurs
• Monitoring the seat occupied recognition and automatic child seat recognition of the front passenger seat
• Storing non-volatile crash telegrams
• Voltage supply of the driver-side frontal acceleration sensor (B48/1), the passenger-side frontal acceleration sensor (B48/2), the driver sidebag and windowbag sensor (A53/1), and the front passenger sidebag and windowbag sensor (A54/1)
• Capacitor for the event of a battery disconnection if a collision occurs
• Self-test and permanent monitoring of the supplemental restraint system (SRS) and fault display with non-volatile storage of faults and downtimes
• Programmability with regard to equipment and crash parameters
• Allocation of the ignition systems to the ignition circuits
• Functional coupling of the ignition circuits
• Fault output via the diagnosis communication
• System readiness display via Controller Area Network bus class B (interior) (CAN-B) to the instrument cluster (A1)
• Actuating the digital crash output (on vehicles with code (494) USA version)

Discrete inputs 

• Circuit 31
• Circuit 15 and circuit 15R
• Front passenger seat occupied and child seat recognition sensor (B48) (on vehicles up to 18.2.04 with code (494) USA version, up to 31.5.05 without code (494) USA version, as of 1.6.05 with code (U18) Automatic child seat recognition (ACSR))
• Front passenger seat occupied recognition sensor (B41/1) (on vehicles without code (494) USA version and as of 1.6.05 without code (U18) Automatic child seat recognition (ACSR)
• Driver sidebag and windowbag sensor (A53/1)
• Front passenger sidebag and windowbag sensor (A54/1)
• Driver-side frontal acceleration sensor (B48/1)
• Passenger-side frontal acceleration sensor (B48/2)
• Driver side seat belt buckle restraint systems switch (S68/3)
• Front passenger-side seat belt buckle restraint systems switch (S68/4)

Discrete inputs and outputs 

• Driver airbag squib 1 (R12/13)
• Driver airbag squib 2 (R12/14)
• Front passenger airbag squib 1 (R12/4)
• Passenger airbag squib 2 (R12/5)
• Driver sidebag squib (R12/9)
• Front passenger sidebag squib (R12/10)
• Left rear sidebag squib (R12/11) (with code (293) Left and right rear sidebag)
• Right rear sidebag squib (R12/12) (with code (293) Left and right rear sidebag)
• Left front windowbag squib (R12/16)
• Right front windowbag squib (R12/17)
• Driver ETR [GUS] squib (R12/1)
• Passenger ETR squib (R12/2)
• Left rear ETR squib (R12/6)
• right rear ETR squib (R12/7)
• Driver belt force limiter (R12/27)
• Front passenger belt force limiter (R12/26)

Discrete outputs 

• Digital crash output to the emergency call system control unit (N123/4) (on vehicles with code (494) USA version)