Supplemental Restraint System Control Unit, Component Description - GF91.60-P-4080FG

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Model 213

up to model year 2021

Fig 1: Supplemental Restraint System Control Unit Components Location - Model 213 Up To Model Year 2021

Courtesy of MERCEDES-BENZ USA

Location

The Supplemental Restraint System control unit is located on the transmission tunnel.

Task

The Supplemental Restraint System control unit has the following tasks:

Read in sensors and signals
Evaluation of input factors
Actuation of components
Transmitting signals

A sensor unit integrated into the supplemental restraint system control unit detects the turn rate, lateral and longitudinal acceleration of the vehicle.

Read in sensors and 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 occupancy recognition (B41/1) (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) (with CODE 293 (Sidebags in rear))
Right rear door pressure sensor (B48/10) (with CODE 293 (Sidebags in rear))
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)
Driver seat position detection switch (S68/19) (with code 460 (Canada version) or code 494 (USA version))
Front passenger seat position detection switch (S68/20) (with code 460 (Canada version) or code 494 (USA version))

Seat occupied recognition LIN

The Weight Sensing System (WSS) control unit (N110) (with code U10 (Automatic front passenger airbag shutoff) sends the status of the seat occupancy recognition via the 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)
Status of collision recognition (with code 239 (DISTRONIC PLUS), code 258 (COLLISION PREVENTION ASSIST) or code 23P (Driving Assistance package Plus) or code P20 (Driving assistance package))

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:

Pyrofuse (F63) (model 213.050)
Pyrotechnical separator (K88) (model 213.050)
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) (with code 460 (Canada version) or code 494 (USA version))
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)
Sidebag squib in left rear (R12/11) (with CODE 293 (Sidebags in rear))
Sidebag squib in right rear (R12/12) (with CODE 293 (Sidebags in rear))
Driver airbag squib 1 (R12/13)
Driver airbag squib 2 (R12/14) (with code 460 (Canada version) or code 494 (USA version))
Left windowbag squib (R12/22)
Right windowbag squib (R12/23)
Driver kneebag squib (R12/25)
Front passenger belt force limiter (R12/26) (with code 460 (Canada version) or code 494 (USA version) or code 498 (Japan version))
Driver belt force limiter (R12/27) (with code 460 (Canada version) or code 494 (USA version) or code 498 (Japan version))
Driver anchor fitting tensioner squib (R12/37) (with code 460 (Canada version) or code 494 (USA version))
Front passenger anchor fitting tensioner squib (R12/38) (with code 460 (Canada version) or code 494 (USA version))
Front passenger airbag bleed valve squib (R12/44) (with code 460 (Canada version) or code 494 (USA version))
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 213.0 with code 306 (Belt airbag))
Right rear belt airbag squib (R12/52) (model 213.0 with code 306 (Belt airbag))
Driver seat side PRE-SAFE® pulse squib (R12/65) (with code 292 (PRE-SAFE® pulse side))
Front passenger seat side PRE-SAFE® pulse squib (R12/66) (with code 292 (PRE-SAFE® pulse side))
Inertisation system squib (R12/69) (with code 2U8 (Alternative refrigerant) and gasoline engine)
Analog crash output to the CDI control unit (N3/9) (diesel engine) or to the 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:

User interface CAN
Vehicle dynamics CAN (CAN H)

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

Vehicle dynamics CAN

The following signals, among others, are sent via the vehicle dynamics CAN:

Turn rate
Lateral acceleration
Longitudinal acceleration

Wiring diagram for Supplemental Restraint System control unit

PE91.60-P-2106-97DBA