GF91.60-P-0002CE Supplemental Restraint System (SRS), Function

GF91.60-P-0002CE Supplemental Restraint System (SRS), Function

Function requirements, general
^ The supplemental restraint system (SRS) must be programmed to the vehicle (left or right-hand drive vehicle, equipment programming and configuration parameters)
^ C. 15R On

The circuit 15 status is sent by the electronic ignition lock control unit (N73) to the chassis CAN (CAN E).

Supplemental restraint system, general
The supplemental restraint system is used to protect the occupants in the event of a crash.

The SRS comprises the following subfunctions:
^ System monitoring function sequence
^ Power reserve function sequence
^ Belt lock system function sequence

Further partial functions are described in separate documents:
^ Passenger-side seat occupied recognition, function (without code (494) USA version)
^ Passenger-side seat occupied recognition, function (model 204.0/9 with code (494) USA version)
^ Deploy supplemental restraint system, function

System monitoring function sequence
The SRS continuously monitors itself and signals system faults via the supplemental restraint system indicator lamp (A1e15) in the instrument cluster (A1) to the driver. The automatic child seat recognition warning lamp (S6/1e1) (with code (U18) Automatic child seat recognition (ACSR [AKSE])) is also switched on. Any faults are stored in the nonvolatile memory of the supplemental restraint system control unit (N2/10). The supplemental restraint system indicator lamp and the automatic child seat recognition warning lamp are switched off following a successful self-test after t = 4 s.

Power reserve function sequence
The supplemental restraint system control unit provides a power reserve for at least t = 300 ms if the battery has been disconnected.

Belt lock system function sequence
Irrespective of the supplemental restraint system control unit, the belt is prevented from extending in certain situations.