Device Features
The SRS-40 system is installed in the steering wheel, in addition to the seat belt, designed to provide additional protection for the driver's head and chest in frontal collisions.
The SRS-40 system is activated in the event of a frontal collision and in directions up to 30°to the left and right of the vehicle's central axis. The SRS-40 system does not provide operation in case of a collision at an angle of more than 30°relative to the central axis of the vehicle, as well as side and rear impacts, in case of a rollover or frontal collision with insufficient collision force to activate the SRS-40 system.
The SRS-40 system consists of the following components:
- block of the gas generator united by the shock deliverer;
- airbag module;
- a special steering wheel with fastening elements for system components.
The system is triggered due to the inertial effect of the impact force on the mechanical sensor, which activates the pyrotechnic part of the gas generator (unlike electrical impulse), which avoids the use of electrical wiring and power supply. Since the system is mechanical, there is no need for a test lamp and a diagnostic unit. The system is always in the ready position and does not require regular maintenance or checks, however, seven years after installation on the car, a mandatory replacement of the gas generator is necessary.
Warning: It is forbidden to reinstall the SRS-40 steering wheel on another type of car, since the shock sensor combined with the gas generator is only adjusted to the parameters and characteristics of the VAZ-21213 car and its modifications.
Due to the differences in the parameters and characteristics of different car models, as well as in the same models of different years of manufacture, it is forbidden to install SRS-40 system components in another car. If the settings are violated or parts of the system are damaged due to an accident or during dismantling, it is forbidden to reinstall the components of the SRS-40 system in the car.
In the event of a car accident, a shock sensor located inside the gas generator block perceives an impulse of the impact force and, at a certain impulse value, activates the system, while nitrogen gas is released from the gas generator through the holes on the body, filling the pillow folded inside the module. When the air bag is filled with gas on the steering wheel cover, the cover breaks along the central seam, opening the halves of the cover up and down. Through the resulting hole in front of the steering wheel, a pillow with a volume of 40 liters is inflated.
The safety function of the SRS-40 system is designed for only one operation, so the steering wheel with gas generator and air bag module, as well as other damaged steering parts, must be replaced after an accident.
Steering with an air bag differs from steering without an air bag by the original steering wheel, in which the gas generator unit and the air bag module are installed, as well as the original steering column mounting bracket. Features of the device and repair of other components and parts of the steering are described in section 5.
Removal and installation
Warnings:
1. All work related to the gas generator and the air bag module must be carried out with special protective goggles and gloves.
2. During all work on the gas generator and the air bag module, always stand to the side of the steering wheel. It is forbidden to place any objects on the steering wheel or between the steering wheel and the worker.
3. Do not use the gas generator unit if it has been dropped from a height of more than 1m or is damaged in any way.
4. It is not recommended to store the gas generator unit above 52°C.
5. When carrying the gas generator unit, keep the openings away from you; it must be placed on any surface so that the holes are at the top; do not place any objects on its body.
6. Do not install the gas generator unit in a loose steering wheel in the vehicle, and do not pierce or turn the igniter through the D-shaped hole located on the gas generator body.
7. It is recommended to keep the gas generator unit in the box and the airbag module in a plastic bag until installation. Do not disassemble and protect the gas generator unit from any damage, as the sealed housing contains solid chemicals that are poisonous, flammable and potentially hazardous to health.
8. In order to avoid false operation of the SRS-40 system, it is forbidden to use percussion instruments on the vehicle steering elements when the SRS-40 system is installed.
Withdrawal. Raise the hood of the car and remove the wire from the terminal «minus» battery. Set the front wheels straight so that the top bars of the steering wheel 5 (pic. 9-45) were in a horizontal position and perform the following operations:
- remove two plugs 9 (pic. 9-46) from the side of the steering wheel;
- being on the side of the steering wheel, unscrew the four bolts securing the airbag module 13; carefully remove the airbag module from the steering wheel;
- pull back the spring-loaded locking tab 4 (pic. 9-47) with a screwdriver and turn the gas generator unit 12 (pic. 9-46) counterclockwise until its base aligns with the slots in adapter 1 (pic. 9-47) steering wheel;
Warning: Do not apply significant force to the gas generator unit when dismantling. If the block does not turn, make sure the locking tab is fully retracted.
Pic. 9-45. Steering:
1 - steering mechanism; 2 - shaft seal; 3 - intermediate shaft; 4 - upper facing casing; 5 - steering wheel; 6 - steering shaft mounting bracket; 7 - lower facing casing; 8 - coupling bolt for fastening the cardan joint; 9 - bolts of fastening of the steering mechanism; 10 - body spar; 11 - bipod.
Pic. 9-46. Steering Details:
1 - steering mechanism; 2 - shaft seal; 3 - intermediate shaft; 4 - upper shaft; 5 - bracket; 6 - upper facing casing; 7 - ball bearing; 8 - bearing race; 9 - plug; 10 - steering wheel; 11 - steering wheel nut; 12 - gas generator unit, combined with a shock sensor; 13 - air bag module; 14 - lower facing casing; 15, 16 - fastening details of the steering shaft bracket; A - fixing pin of the module; B - opening of the igniter device of the D-shaped gas generator block.
Pic. 9-47. Steering wheel:
1 - adapter (gas generator unit fastening device); 2 - spring retainer; 3 - button for turning on the sound signal; 4 - locking tongue; A - a device for setting the system in the ready position - a D-shaped protrusion; B - adapter hole.
- carefully remove the gas generator unit from the steering wheel adapter;
- unscrew nut 11 (pic. 9-46) steering wheel mountings and remove the steering wheel. Further removal of steering components and parts is carried out as described in section 5 of the Repair Manual.
Installation steering control in the reverse order of removal, taking into account the following:
- before installing the steering wheel, make sure that the device «A» (pic. 9-47) to put the system in the ready position (D-shaped protrusion in the center of the steering wheel adapter) was not bent or broken, otherwise the steering wheel must be replaced;
- Install the steering wheel on the steering shaft in such a way that the upper crossbars of the steering wheel are in a horizontal position. Tighten the steering wheel nut with a torque of 31.4-51 N·m (3.2-5.2 kgf·m) and kern at one point;
- before installing the gas generator unit, make sure that there are no jams, knocks and that the steering wheel rotates smoothly when turning the steering wheel to the right and left to the stop; shaking the steering wheel, make sure that there are no radial and axial play of the steering wheel, the identified defects must be eliminated;
- install the gas generator unit into the steering wheel adapter with your right hand. Place the gas generator into the slots of the adapter and turn it clockwise approximately 40°until it stops. In this case, there should be a characteristic click and a hole in the locking tongue 4 (pic. 9-47) must match the hole «IN» in steering wheel adapter 1. In this position, the gas generator unit is in the ready state (i.e. cocked). Turning the gas generator unit during its installation should be carried out only due to the strength of the hands. It is forbidden to install the block if this requires significant effort;
- while outside the vehicle, place the air bag module on the gas generator unit while aligning the fixing pin «A» (pic. 9-46) on a module with a hole «IN» (pic. 9-47) in the steering wheel adapter;
- tighten the module fixing bolts 13 (pic. 9-46) air cushion torque 7-11 Nm;
- Do not cut, drill, or pierce any part of the SRS-40 system.