Seat Belt Control Module: Description and Operation

GF91.60-P-4068CE Component Description For Supplemental Restraint System Control Unit

Component Identification:

Location
The supplemental restraint system control unit is located on the center tunnel.

Task
The supplemental restraint system control unit has the following tasks:
^ Reading in of sensors and signals
^ Evaluation of input factors
^ Actuation of components

Reading in of sensors and signals
The input factors are read in via the following connections:
^ Direct line
^ Chassis CAN (CAN E)

Direct line
The signals from the following components are read via a direct line:
- Left sidebag sensor (A53)
- Right sidebag sensor (A54)
- Front passenger seat occupied recognition (B41/1) (without code (U18) Automatic child seat recognition (ACSR [AKSE]) and without code (494) USA version)
- Front passenger seat occupied recognition and ACSR (B48) (with code (U18) automatic child seat recognition (ACSR))
- 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) Left and right rear sidebag)
- Right rear door pressure sensor (B48/10) (with code (293) Left and right rear sidebag)
- Driver seat belt buckle restraint system switch (S68/3)
- Front passenger seat belt buckle restraint system switch (S68/4)

Chassis CAN
The following signal is also read in over the chassis CAN with code (494) USA version:
- Status of seat occupied recognition from weight sensing system (WSS) control unit (N110) (provided by front SAM control unit with fuse and relay module (N10/1))

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
Actuation of the components takes place via the following connections:
^ Direct line
^ Chassis CAN

Direct line
The following components are actuated via a direct line:
- Pyrofuse 88 (F32f88)
- Driver ETR [GUS] squib (R12/1)
- Passenger ETR 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) (with code (293) Left and right rear sidebag)
- Right rear sidebag squib (R12/12) (with code (293) Left and right rear sidebag)
- Driver airbag squib 1 (R12/13)
- Driver airbag squib 2 (R12/14)
- Left windowbag squib (R12/22)
- Right windowbag squib (R12/23)
- Driver kneebag squib (R12/25) (with code (294) Kneebag)
- Driver pelvis airbag squib (R12/41) (model 204.0/9 with code (494) USA version)
- Passenger pelvis airbag squib (R12/42) (model 204.0/9 with code (494) USA version)
- Driver seat NECK-PRO head restraint solenoid (Y24/12)
- Front passenger seat NECK-PRO head restraint solenoid (Y24/13)
- Analog crash output to the CDI control unit (N3/9) (for diesel engine) or to the ME-SFI [ME] control unit (N3/10) (for gasoline engine)

Chassis CAN
The signals are transmitted by the supplemental restraint system via the chassis CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).$