Supplemental Restraint System Control Unit, Basic Function - GF91.60-P-9890A
MODEL ALL (CAR)
Overview
This document contains the following information:
- Location
- Networking
- Task
Location
The SRS control unit is located at the front under the center console.
Networking
The SRS control unit is connected to the network architecture of the vehicle via the user interface CAN (CAN HMI) and the vehicle dynamics CAN (CAN H).
On vehicles with automatic front passenger airbag actuation, the SRS control unit is also connected via the seat occupancy LIN (LIN E2) to the weight sensing system (WSS) control unit (N110).
Task
The SRS control unit actuates various functions of the passive safety. It is defined by evaluating the signals from various sensors on the type and the severity of accident events.
To implement these tasks, the SRS control unit processes the following information, for example:
- Circuit status
- Acceleration values
- Pressure values in the doors
- Front passenger seat occupied status
- Seat belt buckle status
- Status of collision recognition (vehicles with radar-supported traffic area monitoring)
- Seat position (Canada version, USA version)
- Front bumper pressure values (vehicles with active hood (pedestrian protection))
The SRS control unit analyzes the accident event and decides the extent of and point in time for triggering the restraint equipment. The restraint equipment is triggered via the squibs each time. Then, the SRS control unit starts additional functions when the crash signal is transmitted, e.g. hazard warning lights.
An acceleration sensor is integrated into the SRS control unit. This provides information on the vehicle's natural dynamics.
The SRS control unit sends the following information, among other things:
- Crash signal
- Display fault messages request
- Status of front seat belt buckles
- Information on the vehicle's natural dynamics
- Turn rate
- Lateral acceleration
- Longitudinal acceleration