Seat Belt Control Module: Description and Operation

GF91.60-P-4068CW Supplemental Restraint System Control Unit, Component Description

Component Identification:

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

Task
The supplemental restraint system control unit is used to ensure passive occupant protection. If an accident occurs, the supplemental restraint system control unit triggers the deployment of the restraint equipment. This includes airbag units and the emergency tensioning retractor units. The supplemental restraint systems control unit ensures 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.

Scope of tasks
^ Accident detection and ignition time determination
^ Triggering the ignition stages
^ Triggering the NECK-PRO head restraints
^ Evaluation of the front passenger seat occupation status
^ Storing of non-volatile crash telegrams
^ Fault output via the diagnosis communication
^ Capacitor for the event of a battery disconnection if a collision occurs
^ Self-test and permanent monitoring of the supplemental restraint system (SRS) and fault display with non-volatile storage of faults and downtimes
^ System readiness indication via chassis CAN to the instrument cluster (A1)
^ Support of the automatic seat belt reminder warning via the chassis CAN
^ Output of the signal for transmission of an emergency call via chassis CAN (only (United States Of America) with code (359) TELE AID emergency call system)

Discrete inputs
^ Circuit 31
^ Circuit 30
^ Circuit 15R
^ Left sidebag sensor (A53)
^ Right sidebag sensor (A54)
^ Front passenger seat occupied recognition (B41/1) (without code (U18) Automatic child seat recognition (ACSR [AKSE]), not with (United States Of America))
^ Front passenger seat occupied recognition and ACSR (B48) (with code (U18) Automatic child seat recognition (ACSR [AKSE]))
^ 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)
^ Left front seat belt buckle switch (S68/1)
^ Right front seat belt buckle switch (S68/2)

Discrete outputs
^ 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) (not (United States Of America) and (Canada))
^ Driver seat NECK-PRO head restraint solenoid (Y24/12)
^ Front passenger seat NECK-PRO head restraint solenoid (Y24/13)
^ Analog crash output to the ME-SFI [ME] control unit (N3/10) (with gasoline engine) or to the CDI control unit (N3/9) (with diesel engine)
^ Digital crash output to the emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system)

CAN signals
The supplemental restraint system control unit is a participant of the chassis CAN.