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

The restraint systems control unit (N2/7) is used to ensure passive passenger compartment protection. The restraint systems control unit (N2/7) triggers the restraint systems in the event of an accident. They include all airbags and buckle emergency tensioning retractors. The restraint systems control unit (N2/7) ensures self-monitoring and fault monitoring. Head-on, rear-end and side impact collisions are recorded, and a distinction is made between the different types of collision. The restraint systems can be actuated using conventional squibs.

The tasks are as follows:

• Collision detection and ignition time determination
• Ignition stage triggering when collision occurs
• Voltage supply for the peripheral acceleration pick-up devices, consisting of left sidebag and windowbag sensor (A53/1) and right sidebag and windowbag sensor (A54/1)
• Energy reserves for self-sufficiency case (if battery torn off when collision occurs)
• Separate actuation of digital crash output via the Controller Area Network Bus class B (interior) (CAN-B)
• Storing of non-volatile collision telegrams
• Self-testing and permanent monitoring of system and fault display with non-volatile storage of faults and failure time
• Programming capability with regard to configuration and collision parameters via the CAN-B interface
• Assignment of means of ignition to the ignition circuits via the ignition means assignment table
• Functional doubling of ignition circuits via the function coupling table
• Output of faults via the CAN-B interface after initiating diagnosis communication
• System readiness indication via CAN-B to the instrument cluster (A1)

Labor on or with the connected restraint systems control unit (N2/7) may only be performed when the ignition key is removed "circuit 15C OFF".

The restraint systems control unit (N2/7) features the following inputs:

• Circuit 15
• Terminal 15R
• C. 31
• Left sidebag and windowbag sensor (A53/1) and right sidebag and windowbag sensor (A54/1)
• Passenger seat occupied and child seat recognition sensor (B48)
• Driver seat belt buckle restraint systems switch (S68/3) and front passenger seat belt buckle restraint systems switch (S68/4)

The restraint systems control unit (N2/7) features the following outputs:

• Driver airbag squib 1 (R12/13)
• Driver airbag squib 2 (R12/14)
• Passenger airbag squib 1 (R12/4)

• Front passenger airbag squib 2 (R12/5)
• Left front sidebag squib (R12/20)
• Right front sidebag squib (R12/21)
• left rear sidebag squib (R12/11)
• right rear sidebag squib (R12/12)
• left rear windowbag squib (R12/22)
• the right rear windowbag squib (R12/23)
• driver ETR squib (R12/1)
• passenger ETR ignition squib (R12/2)
• left rear ETR squib (R12/6)
• right rear ETR squib (R12/7)

Self-sufficient capacitor 

The restraint systems control unit (N2/7) has its own capacitor (at least 150 ms) for self-sufficiency case (if battery torn off when collision occurs.

Short-circuit bridges 

The short-circuit bridges create a short circuit in the squibs of the conventional airbag ignition circuits when the connector is removed in order to prevent an involuntary trigger impulse caused by external influences.