GF91.60-P-4018-01QMA Supplemental Restraint System Control Unit, Task

GF91.60-P-4018-01QMA Supplemental Restraint System Control Unit, Task
- as of 1.6.04
- with CODE (494a) USA version

The restraint systems control unit (N2/7) is used to provide passive interior protection. The restraint systems control unit (N2/7) deploys restraint systems if an accident occurs. This includes all the airbags and the seat belt and buckle emergency tensioning retractors. The restraint systems control unit (N2/7) provides 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 ignition squibs.

The individual tasks are:
^ Collision detection and ignition time determination
^ Ignition stage triggering when collision occurs
^ Voltage supply for the peripheral acceleration pick-up, consisting of the driver-side frontal acceleration sensor (B48/1), the passenger-side frontal acceleration sensor (B48/2), the left sidebag and windowbag sensor (A53/1) and the right sidebag and windowbag sensor (A54/1)
^ Energy reserves for self-sufficiency case (if battery torn off when collision occurs)
^ Communication via the Controller Area Network Bus class B (interior) (CAN-B) with the WSS (Weight Sensing System) control unit (N2/13) for detecting the status of the front passenger seat
^ Digital collision output actuation, separately and via 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 link
^ 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 the CAN-B to the instrument cluster (A1)

The connected restraint systems control unit (N2/7) may only be worked on or with if the ignition key has been removed "Circuit 15C OFF".

The restraint systems control unit (N2/7) has the following inputs:
^ Terminal 15
^ Circuit 15R
^ (Tml. 31)
^ Left sidebag and windowbag sensor (A53/1) and right sidebag and windowbag sensor (A54/1)
^ Driver-side frontal acceleration sensor (B48/1) and passenger-side frontal acceleration sensor (B48/2)
^ 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) has the following outputs:
^ driver airbag squib 1 (R12/13)
^ driver airbag squib 2 (R12/14)
^ Passenger airbag squib 1 (R12/4)
^ Passenger airbag squib 2 (R12/5)
^ Front left sidebag squib (R12/20)
^ Right front sidebag squib (R12/21)
^ left rear sidebag squib (R12/11)
^ right rear sidebag squib (R12/12)
^ Left windowbag squib (R12/22)
^ Right windowbag squib (R12/23)
^ Driver ETR [GUS] squib (R12/1)
^ Front passenger ETR [GUS] squib (R12/2)
^ left rear ETR squib (R12/6)
^ right rear ETR squib (R12/7)
^ Digital collision output to emergency call system control unit (N123/4)

Independent power reserves
The restraint systems control unit (N2/7) has its own power reserves (for at least 150 ms) in case the battery is torn off in a crash.

Short-circuiting jumpers
The short-circuiting jumpers short circuit the squibs of the conventional airbag ignition circuits if the connector has been removed in order to prevent unintentional deployment because of external influences.