Air Bag Control Module: Description and Operation

GF91.60-P-4068CA 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) (with code (494) USA version)

Direct line
The signals from the following components are read via direct lines:
- Left sidebag sensor (A53)
- Right sidebag sensor (A54)
- Passenger seat occupied recognition (B41/1) (U18) Automatic child seat recognition (ACSR), 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)
- With code (U60) Pedestrian protection:
- Left front bumper pedestrian protection sensor (B151/1)
- Center front bumper pedestrian protection sensor (B151/2)
- Right front bumper pedestrian protection sensor (B151/3)
- Right engine hood contact switch (S62/42)
- Left engine hood contact switch (S62/43)

- Driver seat belt buckle restraint system switch (S68/3)
- Front passenger seat belt buckle restraint system switch (S68/4)

Chassis CAN (with code (494) USA version)
The status of the seat occupied recognition is provided by the weight sensing system (WSS) control unit (N110) via the interior CAN (CAN B) and relayed by the front SAM control unit with fuse and relay module (N10/1) via the chassis CAN.

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 150 (F32f150) (without code (B03) ECO start/stop function)
- Pyrofuse (F63) (with code (B03) ECO start/stop function)
- 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) (model 207.3)
- Front passenger sidebag squib (R12/10) (model 207.3)
- 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) (model 207.3)
- Right windowbag squib (R12/23) (model 207.3)
- Driver kneebag squib (R12/25)
- Left Head/Thorax bag squib (R12/39) (model 207.4)
- Right Head/Thorax bag squib (R12/40) (model 207.4)
- Driver pelvis airbag squib (R12/41) (with code (291) PELVIS AIRBAG (PELVISBAG))
- Front passenger pelvis airbag squib (R12/42) (with code (291) PELVIS AIRBAG (PELVISBAG))
- Driver seat NECK-PRO head restraint solenoid (Y24/12)
- Front passenger seat NECK-PRO head restraint solenoid (Y24/13)
- Left roll bar trigger solenoid (Y57/2) (model 207.4)
- Right roll bar trigger solenoid (Y57/3) (model 207.4)
- Left rear engine hood lifter (Y127/1) (with code (U60) Pedestrian protection)
- Right rear engine hood lifter (Y127/2) (with code (U60) Pedestrian protection)
- Analog crash output to the CDI control unit (N3/9) (with diesel engine) or to the ME-SFI [ME] control unit (N3/10) (with 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).$