N2/10 | Supplemental restraint system control unit |
P91.60-4310-05
Location
The Supplemental Restraint System control unit is located on the transmission tunnel.
Tasks
The supplemental restraint system control unit has the following tasks:
Reading in of signals
Evaluation of input factors
Actuation of components
Transmitting signals
Model 217, 222
with code 494 (US version)
An accident data recorder is integrated in the Supplemental Restraint System control unit; it records relevant data before, during, and after an accident. The data stored can be used to trace back the course of the accident.
Reading in of signals
The input factors are read in via the following connections:
Direct line
Seat occupied recognition LIN (LIN E2)
User interface CAN (CAN HMI)
Direct line
The signals from the following sensors are read in via direct lines:
Left sidebag sensor (A53)
Right sidebag sensor (A54)
Front passenger seat occupied recognition (B41/1) (model 222 except code U18 (Automatic child seat recognition ACSR [AKSE]) and except code U10 (Automatic front passenger airbag shutoff))
Left frontal acceleration sensor (B48/1)
Right frontal acceleration sensor (B48/2)
Left front door pressure sensor (B48/7)
Right front door pressure sensor (B48/8)
Left rear door pressure sensor (B48/9) (model 222)
Right rear door pressure sensor (B48/10) (model 222)
Left front bumper pedestrian protection sensor (B151/1) (with CODE U60 (Active engine hood (pedestrian protection)))
Right front bumper pedestrian protection sensor (B151/3) (with CODE U60 (Active engine hood (pedestrian protection)))
Driver seat belt buckle switch (S68/3)
Front passenger seat belt buckle switch (S68/4)
Seat occupied recognition LIN
The weight sensing system (WSS) control unit (N110) (with code U10 (Automatic front passenger airbag shutoff)) or the front passenger seat occupied recognition and ACSR [AKSE] (B48) (model 222 with code U18 (Automatic child seat recognition ACSR [AKSE])) sends the status of the front passenger seat occupancy via seat occupancy LIN to the supplemental restraint system control unit.
User interface CAN
The following signals are read in via the user interface CAN among other things:
Status of left rear seat belt buckle switch (S68/11)
Status of right rear seat belt buckle switch (S68/12)
Vehicle lateral acceleration status
Autonomous brake application (with code P20(Driving Assistance package Plus))
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.
Actuation of components
The following components are actuated via direct lines:
High-voltage pyrofuse (F33f51) (model 222.004/057/104/157/163)
Pyrotechnical separator (K88)
Driver emergency tensioning retractor squib (R12/1)
Front passenger emergency tensioning retractor squib (R12/2)
Front passenger airbag squib 1 (R12/4)
Front passenger airbag squib 2 (R12/5)
Left rear emergency tensioning retractor squib (R12/6)
Right rear emergency tensioning retractor squib (R12/7)
Driver sidebag squib (R12/9)
Front passenger sidebag squib (R12/10)
Left rear sidebag squib (R12/11)
Right rear sidebag squib (R12/12)
Driver airbag squib 1 (R12/13)
Driver airbag squib 2 (R12/14)
Left windowbag squib (R12/22) (model 222, 217.3)
Right windowbag squib (R12/23) (model 222, 217.3)
Front passenger kneebag squib (R12/24) (model 217 with CODE 494 (USA version) or CODE 460 (Canada version))
Driver kneebag squib (R12/25) (with CODE 494 (USA version) or CODE 460 (Canada version))
Front passenger belt force limiter (R12/26) (with CODE 494 (USA version) or CODE 460 (Canada version))
Driver belt force limiter (R12/27) (with CODE 494 (USA version) or CODE 460 (Canada version))
Left headbag squib (R12/39) (model 217.4)
Right headbag squib (R12/40) (model 217.4)
Front passenger airbag bleed valve squib (R12/44)
Left active engine hood squib (R12/49) (with CODE U60 (Active engine hood (pedestrian protection)))
Right active engine hood squib (R12/50) (with CODE U60 (Active engine hood (pedestrian protection)))
Left rear belt airbag squib (R12/51) (model 222 with code 306 (Belt airbag))
Right rear belt airbag squib (R12/52) (model 222 with code 306 (Belt airbag))
Left rear cushion airbag squib (R12/57) (model 222 with code 453 (Rear reclining seats))
Right rear cushion airbag squib (R12/58) (model 222 with code 453 (Rear reclining seats))
Left roll bar squib (R12/61) (model 217.4)
Right roll bar squib (R12/62) (model 217.4)
Inertisation system squib (R12/69) (with code 2U8 (Alternative refrigerant) and gasoline engine)
Driver PRE-SAFE® pulse squib (R46)
Front passenger PRE-SAFE® pulse squib (R46/1)
Analog crash output to CDI control unit (N3/9) (diesel engine) or ME-SFI [ME] control unit (N3/10) (gasoline engine)
Analog crash output to front SAM control unit (N10/6)
Transmitting signals
The signals are transmitted via the following connections:
Seat occupied recognition LIN
User interface CAN
Seat occupied recognition LIN
The following signals, among others, are sent over the seat occupancy LIN:
Crash signal
Status of driver seat belt buckle switch
Status of front passenger seat belt buckle switch
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
User interface CAN
The following signals are sent via the user interface CAN among other things:
Crash signal
Display fault message request
Status of driver seat belt buckle switch
Status of front passenger seat belt buckle switch
Supplemental Restraint System indicator lamp in the instrument cluster (A1)
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).