Supplemental Restraint System Function - GF91.60-P-0003KJU

MODEL 453.3/4 

with CODE 494 (US version) 

Courtesy of MERCEDES-BENZ USA

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)
• Circuit 15 ON

The supplemental restraint system control unit receives the status of circuit 15 of the ignition lock via a direct line from the vehicle interior fuse and relay module.

After circuit 15 has been switched off, parts of the SRS remain active for a certain run-on time.

Power reserve: The SRS control unit provides a power reserve for at least t = 300 ms if the battery has been disconnected.

Supplemental restraint system, general 

The SRS is used for occupant protection, and on vehicles with code 494 (USA version), includes as standard two-stage driver and front passenger airbags, windowbags and sidebags in the front seats, which are designed as headbags/thoraxbags. The seat belts are also equipped with buckle emergency tensioning retractors, emergency tensioning retractors and two-stage belt force limiters. For the national versions with code 494 (USA version), code 294 (Kneebag) is part of the standard equipment for the driver and front passenger. Vehicles with code 460 (Canada version) are always assigned code 494 (USA version) at the same time and therefore they have the same SRS safety equipment.

Belt lock: The belt is prevented from extending in certain situations, irrespective of the status of the SRS.

The following subfunctions are described in separate documents:

• Passenger-side seat occupied recognition function
• Supplemental restraint system deployment function