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Airbags (SRS)
On cars the auxiliary safety system (SRS - Supplemental Restrain System) better known as airbags. The system consists of sensors mounted on the front side of the vehicle, and the airbag control unit and diagnosis. By car airbag system type HAE-3. HAE-3 system can be installed in a variety of designs DAB 2BPT, DAB PAB 2BPT, DAB PAB 2BPT 2FSAB (DAB - driver airbag, PAB - front passenger airbag, BPT - belt tensioner, FSAB - side airbag). SRS consists of air bag on the driver side, in the center of the steering wheel and containing a folded cushion and a gas generator unit; airbag on the passenger side, located in the instrument panel and containing a folded cushion and a gas generator unit; side airbags located in the backside of the driver and front passenger, and containing the folded airbag and gas generator unit. The control unit SRSCM located on the floor of the car under the radiator and heater controls and the airbag system comprises: an accelerometer that detects vehicle deceleration; spiral wire (spring), located in the steering column; electrical circuits and connections; knee bolster located below the steering column. Coiled wire transmits a signal regardless of the position of the steering wheel. The moment of collision SRSCM unit determines, based on information from the accelerometer, which continuously monitors the acceleration of the vehicle. The deployment of the airbag takes place in a frontal or near-frontal collision with a moderate or great effort. The pyrotechnic gas generator converts the electrical signal to a control signal to ignite, resulting decomposed powder, bag inflating airbags. To service the air bag or SRS components should be allowed only by specially trained personnel. When servicing the SRS is necessary to exercise extreme caution to avoid personal injury when airbags deploy unauthorized driver or front passenger. Safety measures If you violate shutdown sequence or services airbag system can occur unauthorized deployment of airbags and serious personal injury. Also, improper maintenance of the airbag system may lead to the fact that the airbag will not work in a collision. Before performing maintenance, including the removal or installation of elements of the system, carefully follow these recommendations. - Before servicing the airbag system, make sure that it has been at least 30 seconds after the ignition is turned off and disconnect the wire from the negative terminal of the battery. The airbag system is equipped with an emergency source of energy, which you can deploy the airbag in the event of disconnecting the wires from the battery when the crash. The time during which the emergency source of power provides energy to the airbag system is 150 ms.
- When you disconnect the wire from the negative terminal of the battery is erased memory clock and sound systems. Before you begin, remove the information from the sound system. After finishing work, set the time on the clock and repeat the installation of sound systems.
- Signs of a system crash the airbag is difficult to verify, so that diagnostic codes are the most important source of information for troubleshooting.
- When troubleshooting system airbags before disconnecting the battery, check the fault codes stored in memory.
- Do not use replacement parts airbags from other cars.
- Do not disassemble or repair the components of the system of airbags.
- If any component of the SRS or fell on it there are cracks, dents or other defects in the case, bracket or connector, replace them with new ones.
- After work, test the system airbags.
In some cases, the electric circuit of airbag warning lamp may be broken another circuit malfunction. Therefore, if the airbag warning lamp is lit, check that all the DTC erased from memory. - When carrying out electrical welding work is required to disconnect the wire from the negative battery terminal.
Module (DAB, PAB, SAB) Modules DAB (driver airbag), RAV (front passenger airbag), DSAB (driver side airbag) and PSAB (passenger side airbag) consist of the device opening and pillows. The device uncovering (gasifier) is located in the airbag. When a frontal collision of sufficient force to close the circuit through the sensor SRSCM Airbag current begins to flow. This current charge ignites the gas generator and the airbag opens. - When removing the air bag, or work with the new airbag needs to be positioned so that the surface of the cushion facing upwards. When the lever lock connector with the double lock must be in the locked state.
- Never measure the resistance of the airbag squib, as this may lead to its operation.
- Store the airbag at a temperature not exceeding 93 ?� C, no humidity, and electrical noise.
- When using electric welding before starting work disconnect the connectors from the airbag.
SRS wiring harness SRS harness is located inside the tube of yellow color, which is different from other systems, wiring harnesses. In jacks on the DAB, PAB, DSAB, PSAB and BPT are bridges which short circuits when disconnecting the connectors, which prevents unwanted expansion is airbags. The indicator lamp SRSCM The warning lamp SRS, located in the instrument cluster is controlled from the unit SRSCM. Under certain fault SRSCM can not function, and thus, can not operate the control lamp. In these cases, the lamp is activated directly from the corresponding circuit, which operates independently of SRSCM. - In the absence of voltage applied to the SRSCM lights up continuously.
- In the absence of an internal operating voltage lights up continuously.
- If SRSCM not connected, the lamp is activated via jumper harness connector.
The coil spring The coil spring consists of two twisted coils. It is installed between the steering column and the steering wheel and allows the steering wheel to rotate, keeping constant contact circuit security system. The steering wheel should be properly installed on the steering column with a spiral spring set in the neutral position, otherwise may break the wire or other malfunction. Airbag and a spiral wire Withdrawal Check airbags If any defects should be replaced airbag.  | Do not attempt to measure the circuit resistance of the pyrotechnic gas generator airbags as possible unauthorized deployment of the driver's airbag. |
| - Check on the cover of the airbag for dents, cracks or deformation.
- Check the airbag in the absence of indentation, cracking or deformation.
- Check the condition of hooks and connectors for damage, oxidation damage to the connector pins and the wire harness.
- Check the housing of the gas generator pyrotechnic airbag for dents, cracks or deformation.
- Place the airbag to the steering wheel to check alignment and its suitability.
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Checking the spiral wire (spring) | - If any defects should be replaced spiral wire.
- Check the electrical connectors and yellow protective tube for damage and oxidation of the contacts of the connector.
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The front passenger airbag Withdrawal | - Do not disassemble or repair the components of an airbag system.
- If an airbag has been dropped or it is exposed to water, grease or oil, and if there are cracks, dents or other defects in the hull or connector, replace the airbag.
- The removed air bag should be stored in a clean, dry place, face up. Do not place in the airbag foreign objects that the deployment of the airbag can cause serious injury.
- Do not expose the air bag to a temperature above 93 ?� C.
- Undeployed airbag unit should be located only in accordance with prescribed procedures.
- Do not attempt to measure the circuit resistance of the pyrotechnic gas generator airbags as possible unauthorized deployment of the driver's airbag.
- After airbag deployment should be replaced with a wire that has been exposed to the gases of the pyrotechnic gas generator.
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| - Disconnect the negative battery terminal.
| Before servicing the airbag system, make sure that it has been at least 30 seconds after the ignition is turned off and disconnect the wire from the negative terminal of the battery. |
- Remove the glovebox.
- Disconnect the electrical connector airbags.
- Remove the dashboard and airbag.
- The outer layer of the front passenger airbag is integrated with the instrument panel, so the expansion is necessary to replace the airbag instrument panel.
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